diff --git a/packages/outline/src/core/OutlineBlockNode.js b/packages/outline/src/core/OutlineBlockNode.js
index 3212a5125..ae7ce3c75 100644
--- a/packages/outline/src/core/OutlineBlockNode.js
+++ b/packages/outline/src/core/OutlineBlockNode.js
@@ -9,7 +9,7 @@
 
 import type {NodeKey} from './OutlineNode';
 
-import {isTextNode, TextNode} from '.';
+import {isTextNode, TextNode, isLineBreakNode} from '.';
 import {
   OutlineNode,
   getNodeByKey,
@@ -215,7 +215,12 @@ export class BlockNode extends OutlineNode {
       updateDirectionIfNeeded(writableNodeToAppend);
     }
     // Handle immutable/segmented
-    if (flags & IS_IMMUTABLE || flags & IS_SEGMENTED || flags & IS_INERT) {
+    if (
+      flags & IS_IMMUTABLE ||
+      flags & IS_SEGMENTED ||
+      flags & IS_INERT ||
+      isLineBreakNode(writableNodeToAppend)
+    ) {
       wrapInTextNodes(writableNodeToAppend);
     }
     return writableSelf;
diff --git a/packages/outline/src/core/OutlineNode.js b/packages/outline/src/core/OutlineNode.js
index e290ca2b8..dd8728fb6 100644
--- a/packages/outline/src/core/OutlineNode.js
+++ b/packages/outline/src/core/OutlineNode.js
@@ -14,6 +14,7 @@ import type {Node as ReactNode} from 'react';
 import {
   createTextNode,
   isBlockNode,
+  isLineBreakNode,
   isTextNode,
   isRootNode,
   BlockNode,
@@ -155,7 +156,12 @@ function replaceNode<N: OutlineNode>(
     updateDirectionIfNeeded(writableReplaceWith);
   }
   // Handle immutable/segmented
-  if (flags & IS_IMMUTABLE || flags & IS_SEGMENTED || flags & IS_INERT) {
+  if (
+    flags & IS_IMMUTABLE ||
+    flags & IS_SEGMENTED ||
+    flags & IS_INERT ||
+    isLineBreakNode(writableReplaceWith)
+  ) {
     wrapInTextNodes(writableReplaceWith);
   }
   if (isTextNode(writableReplaceWith) && anchorOffset !== undefined) {
@@ -628,7 +634,12 @@ export class OutlineNode {
       updateDirectionIfNeeded(writableNodeToInsert);
     }
     // Handle immutable/segmented
-    if (flags & IS_IMMUTABLE || flags & IS_SEGMENTED || flags & IS_INERT) {
+    if (
+      flags & IS_IMMUTABLE ||
+      flags & IS_SEGMENTED ||
+      flags & IS_INERT ||
+      isLineBreakNode(writableNodeToInsert)
+    ) {
       wrapInTextNodes(writableNodeToInsert);
     }
     return writableSelf;
@@ -663,7 +674,12 @@ export class OutlineNode {
       updateDirectionIfNeeded(writableNodeToInsert);
     }
     // Handle immutable/segmented
-    if (flags & IS_IMMUTABLE || flags & IS_SEGMENTED || flags & IS_INERT) {
+    if (
+      flags & IS_IMMUTABLE ||
+      flags & IS_SEGMENTED ||
+      flags & IS_INERT ||
+      isLineBreakNode(writableNodeToInsert)
+    ) {
       wrapInTextNodes(writableNodeToInsert);
     }
     return writableSelf;
diff --git a/scripts/error-codes/codes.json b/scripts/error-codes/codes.json
index fb628cc6a..7d8dd7b0d 100644
--- a/scripts/error-codes/codes.json
+++ b/scripts/error-codes/codes.json
@@ -40,5 +40,10 @@
   "38": "findIndexInPrevChildren: index in prevChildren not found",
   "39": "reconcileNodeChildren: keyToMove to was not nextStartKey",
   "40": "storeDOMWithNodeKey: key was null",
-  "41": "Reconciliation: could not find DOM element for node key \"${key}\""
+  "41": "Reconciliation: could not find DOM element for node key \"${key}\"",
+  "42": "getTextContent: base method not extended",
+  "43": "decorate: base method not extended",
+  "44": "getAnchorNode: anchorNode not a text or decorator node",
+  "45": "getFocusNode: focusNode not a text or decorator node",
+  "46": "undecorate: base method not extended"
 }