diff --git a/actions-expressions/src/completion.test.ts b/actions-expressions/src/completion.test.ts
index 810cd44..64e9283 100644
--- a/actions-expressions/src/completion.test.ts
+++ b/actions-expressions/src/completion.test.ts
@@ -70,6 +70,12 @@ describe("auto-complete", () => {
     });
   });
 
+  describe("in multi-line expressions", () => {
+    it("includes built-in functions", () => {
+      expect(testComplete("1 == (\nto").map(x => x.label)).toContainEqual("toJson");
+    });
+  });
+
   describe("for contexts", () => {
     it("provides suggestions for env", () => {
       const expected = completionItems("BAR_TEST", "FOO");
diff --git a/actions-languageservice/src/utils/transform.test.ts b/actions-languageservice/src/utils/transform.test.ts
index ba4d85d..db91c60 100644
--- a/actions-languageservice/src/utils/transform.test.ts
+++ b/actions-languageservice/src/utils/transform.test.ts
@@ -37,7 +37,7 @@ jobs:
 jobs:
   build:
     runs-on:
-      - dummy`);
+      - key`);
     expect(newPos.character).toEqual(9);
   });
 
@@ -53,7 +53,23 @@ jobs:
 jobs:
   build:
     runs-on:
-      dummy:`);
+      key:`);
     expect(newPos.character).toEqual(7);
   });
+
+  it("does not transform expression lines", () => {
+    const [doc, pos] = getPositionFromCursor(`on: push
+jobs:
+  build:
+    runs-on:
+      \${{ github| }}`);
+    const [newDoc, newPos] = transform(doc, pos);
+
+    expect(newDoc.getText()).toEqual(`on: push
+jobs:
+  build:
+    runs-on:
+      \${{ github }}`);
+    expect(newPos.character).toEqual(16);
+  });
 });
diff --git a/actions-languageservice/src/utils/transform.ts b/actions-languageservice/src/utils/transform.ts
index 015f709..a71ef9e 100644
--- a/actions-languageservice/src/utils/transform.ts
+++ b/actions-languageservice/src/utils/transform.ts
@@ -1,7 +1,7 @@
 import {Position, TextDocument} from "vscode-languageserver-textdocument";
 import {Range} from "vscode-languageserver-types";
 
-const DUMMY_KEY = "dummy";
+const PLACEHOLDER_KEY = "key";
 
 // Transform a document to work around YAML parsing issues
 // Based on `_transform` in https://github.com/cschleiden/github-actions-parser/blob/main/src/lib/parser/complete.ts#L311
@@ -27,29 +27,33 @@ export function transform(doc: TextDocument, pos: Position): [TextDocument, Posi
   // Special case for Actions, if this line contains an expression marker, do _not_ transform. This is
   // an ugly fix for auto-completion in multi-line YAML strings. At this point in the process, we cannot
   // determine if a line is in such a multi-line string.
-  if (line.indexOf("${{") === -1) {
-    const colon = line.indexOf(":");
-    if (colon === -1) {
-      const trimmedLine = line.trim();
-      if (trimmedLine === "" || trimmedLine === "-") {
-        // Node in sequence or empty line
-        let spacer = "";
-        if (trimmedLine === "-" && !line.endsWith(" ")) {
-          spacer = " ";
-          offset++;
-        }
+  if (line.indexOf("${{") !== -1) {
+    return [doc, pos];
+  }
 
-        line =
-          line.substring(0, linePos) + spacer + DUMMY_KEY + (trimmedLine === "-" ? "" : ":") + line.substring(linePos);
-
-        // Adjust pos by one to prevent a sequence node being marked as active
+  const containsColon = line.indexOf(":") !== -1;
+  if (!containsColon) {
+    const trimmedLine = line.trim();
+    if (trimmedLine === "" || trimmedLine === "-") {
+      // Pos in sequence or empty line
+      let spacer = "";
+      if (trimmedLine === "-" && !line.endsWith(" ")) {
+        spacer = " ";
         offset++;
-      } else if (!trimmedLine.startsWith("-")) {
-        // Add `:` to end of line
-        line = line + ":";
       }
-    } else {
-      offset = offset - 1;
+
+      line =
+        line.substring(0, linePos) +
+        spacer +
+        PLACEHOLDER_KEY +
+        (trimmedLine === "-" ? "" : ":") +
+        line.substring(linePos);
+
+      // Adjust pos by one to prevent a sequence node being marked as active
+      offset++;
+    } else if (!trimmedLine.startsWith("-")) {
+      // Add `:` to end of line
+      line = line + ":";
     }
   }