diff --git a/CHANGELOG.md b/CHANGELOG.md
index f39308e5ff..f1564848b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,11 +1,12 @@
 # Svelte changelog
 
-## Unreleased
+## 3.19.2
 
 * In `dev` mode, display a runtime warning when a component is passed an unexpected slot ([#1020](https://github.com/sveltejs/svelte/issues/1020), [#1447](https://github.com/sveltejs/svelte/issues/1447))
 * In `vars` array, correctly indicate whether `module` variables are `mutated` or `reassigned` ([#3215](https://github.com/sveltejs/svelte/issues/3215))
 * Fix spread props not updating in certain situations ([#3521](https://github.com/sveltejs/svelte/issues/3521), [#4480](https://github.com/sveltejs/svelte/issues/4480))
 * Use the fallback content for slots if they are passed only whitespace ([#4092](https://github.com/sveltejs/svelte/issues/4092))
+* Fix bitmask overflow for `{#if}` blocks ([#4263](https://github.com/sveltejs/svelte/issues/4263))
 * In `dev` mode, check for unknown props even if the component has no writable props ([#4323](https://github.com/sveltejs/svelte/issues/4323))
 * Exclude global variables from `$capture_state` ([#4463](https://github.com/sveltejs/svelte/issues/4463))
 * Fix bitmask overflow for slots ([#4481](https://github.com/sveltejs/svelte/issues/4481))
diff --git a/package-lock.json b/package-lock.json
index f0f4e17422..014348f37e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "3.19.1",
+  "version": "3.19.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 7a02f1da10..009e5143a9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "3.19.1",
+  "version": "3.19.2",
   "description": "Cybernetically enhanced web apps",
   "module": "index.mjs",
   "main": "index",
diff --git a/site/content/docs/03-run-time.md b/site/content/docs/03-run-time.md
index c75ec694d9..0bbae24185 100644
--- a/site/content/docs/03-run-time.md
+++ b/site/content/docs/03-run-time.md
@@ -974,7 +974,7 @@ app.count += 1;
 Svelte components can also be compiled to custom elements (aka web components) using the `customElement: true` compiler option. You should specify a tag name for the component using the `<svelte:options>` [element](docs#svelte_options).
 
 ```html
-<svelte:options tag="my-element">
+<svelte:options tag="my-element" />
 
 <script>
 	export let name = 'world';
diff --git a/src/compiler/compile/render_dom/Renderer.ts b/src/compiler/compile/render_dom/Renderer.ts
index 9946ed53d3..e933faf97a 100644
--- a/src/compiler/compile/render_dom/Renderer.ts
+++ b/src/compiler/compile/render_dom/Renderer.ts
@@ -233,6 +233,7 @@ export default class Renderer {
 			return bitmask;
 		};
 
+		// TODO: context-overflow make it less gross
 		return {
 			// Using a ParenthesizedExpression allows us to create
 			// the expression lazily. TODO would be better if
diff --git a/src/compiler/compile/render_dom/wrappers/IfBlock.ts b/src/compiler/compile/render_dom/wrappers/IfBlock.ts
index dfc2228bc5..207e1e349e 100644
--- a/src/compiler/compile/render_dom/wrappers/IfBlock.ts
+++ b/src/compiler/compile/render_dom/wrappers/IfBlock.ts
@@ -9,7 +9,7 @@ import FragmentWrapper from './Fragment';
 import { b, x } from 'code-red';
 import { walk } from 'estree-walker';
 import { is_head } from './shared/is_head';
-import { Identifier, Node } from 'estree';
+import { Identifier, Node, UnaryExpression } from 'estree';
 
 function is_else_if(node: ElseBlock) {
 	return (
@@ -288,7 +288,7 @@ export default class IfBlockWrapper extends Wrapper {
 		}
 
 		block.chunks.init.push(b`
-			let ${current_block_type} = ${select_block_type}(#ctx, -1);
+			let ${current_block_type} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()});
 			let ${name} = ${get_block};
 		`);
 
@@ -407,12 +407,12 @@ export default class IfBlockWrapper extends Wrapper {
 
 		if (has_else) {
 			block.chunks.init.push(b`
-				${current_block_type_index} = ${select_block_type}(#ctx, -1);
+				${current_block_type_index} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()});
 				${name} = ${if_blocks}[${current_block_type_index}] = ${if_block_creators}[${current_block_type_index}](#ctx);
 			`);
 		} else {
 			block.chunks.init.push(b`
-				if (~(${current_block_type_index} = ${select_block_type}(#ctx, -1))) {
+				if (~(${current_block_type_index} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()}))) {
 					${name} = ${if_blocks}[${current_block_type_index}] = ${if_block_creators}[${current_block_type_index}](#ctx);
 				}
 			`);
@@ -587,4 +587,21 @@ export default class IfBlockWrapper extends Wrapper {
 			`);
 		}
 	}
+
+	get_initial_dirty_bit() {
+		const _this = this;
+		// TODO: context-overflow make it less gross
+		const val: UnaryExpression = x`-1` as UnaryExpression;
+		return {
+			get type() {
+				return _this.renderer.context_overflow ? 'ArrayExpression' : 'UnaryExpression';
+			},
+			// as [-1]
+			elements: [val],
+			// as -1
+			operator: val.operator,
+			prefix: val.prefix,
+			argument: val.argument,
+		};
+	}
 }
diff --git a/src/compiler/compile/render_dom/wrappers/shared/get_slot_definition.ts b/src/compiler/compile/render_dom/wrappers/shared/get_slot_definition.ts
index 9ab48dd035..0f28689df3 100644
--- a/src/compiler/compile/render_dom/wrappers/shared/get_slot_definition.ts
+++ b/src/compiler/compile/render_dom/wrappers/shared/get_slot_definition.ts
@@ -63,7 +63,7 @@ export function get_slot_definition(block: Block, scope: TemplateScope, lets: Le
 	const { context_lookup } = block.renderer;
 
 	// i am well aware that this code is gross
-	// TODO make it less gross
+	// TODO: context-overflow make it less gross
 	const changes = {
 		type: 'ParenthesizedExpression',
 		get expression() {
diff --git a/test/runtime/samples/bitmask-overflow-if/_config.js b/test/runtime/samples/bitmask-overflow-if/_config.js
new file mode 100644
index 0000000000..74bc70d414
--- /dev/null
+++ b/test/runtime/samples/bitmask-overflow-if/_config.js
@@ -0,0 +1,24 @@
+export default {
+	html: `
+		012345678910111213141516171819202122232425262728293031323334353637383940
+		expected: true
+		if: true
+		<button></button>
+	`,
+
+	async test({ assert, component, target, window }) {
+		const button = target.querySelector("button");
+		await button.dispatchEvent(new window.MouseEvent("click"));
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+			112345678910111213141516171819202122232425262728293031323334353637383940
+			expected: false
+			if: false
+			<div></div>
+			<button></button>
+		`
+		);
+	}
+};
diff --git a/test/runtime/samples/bitmask-overflow-if/main.svelte b/test/runtime/samples/bitmask-overflow-if/main.svelte
new file mode 100644
index 0000000000..2c1c453091
--- /dev/null
+++ b/test/runtime/samples/bitmask-overflow-if/main.svelte
@@ -0,0 +1,62 @@
+<script>
+	import { fade } from 'svelte/transition';
+	export let _a = [];
+	export let _0 = '0';
+	export let _1 = '1';
+	export let _2 = '2';
+	export let _3 = '3';
+	export let _4 = '4';
+	export let _5 = '5';
+	export let _6 = '6';
+	export let _7 = '7';
+	export let _8 = '8';
+	export let _9 = '9';
+	export let _10 = '10';
+	export let _11 = '11';
+	export let _12 = '12';
+	export let _13 = '13';
+	export let _14 = '14';
+	export let _15 = '15';
+	export let _16 = '16';
+	export let _17 = '17';
+	export let _18 = '18';
+	export let _19 = '19';
+	export let _20 = '20';
+	export let _21 = '21';
+	export let _22 = '22';
+	export let _23 = '23';
+	export let _24 = '24';
+	export let _25 = '25';
+	export let _26 = '26';
+	export let _27 = '27';
+	export let _28 = '28';
+	export let _29 = '29';
+	export let _30 = '30';
+	export let _31 = '31';
+	export let _32 = '32';
+	export let _33 = '33';
+	export let _34 = '34';
+	export let _35 = '35';
+	export let _36 = '36';
+	export let _37 = '37';
+	export let _38 = '38';
+	export let _39 = '39';
+	export let _40 = '40';
+
+	function update() {
+		_0 = '1';
+	}
+</script>
+
+
+{_0}{_1}{_2}{_3}{_4}{_5}{_6}{_7}{_8}{_9}{_10}{_11}{_12}{_13}{_14}{_15}{_16}{_17}{_18}{_19}{_20}{_21}{_22}{_23}{_24}{_25}{_26}{_27}{_28}{_29}{_30}{_31}{_32}{_33}{_34}{_35}{_36}{_37}{_38}{_39}{_40}
+
+expected: {_a.indexOf(_0) && _0 === '0' && _1 === '1'}
+{#if _a.indexOf(_0) && _0 === '0' && _1 === '1'}
+if: true
+{:else}
+if: false
+<div out:fade></div>
+{/if}
+
+<button on:click={update}></button>
\ No newline at end of file