diff --git a/src/main/java/com/google/devtools/build/lib/bazel/bzlmod/SingleExtensionUsagesValue.java b/src/main/java/com/google/devtools/build/lib/bazel/bzlmod/SingleExtensionUsagesValue.java
index 2daeac3132866b..b75e3955b02aa7 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/bzlmod/SingleExtensionUsagesValue.java
+++ b/src/main/java/com/google/devtools/build/lib/bazel/bzlmod/SingleExtensionUsagesValue.java
@@ -84,9 +84,7 @@ SingleExtensionUsagesValue trimForEvaluation() {
     return SingleExtensionUsagesValue.create(
         ImmutableMap.copyOf(
             Maps.transformValues(getExtensionUsages(), ModuleExtensionUsage::trimForEvaluation)),
-        // extensionUniqueName: Not accessible to the extension's implementation function.
-        // TODO: Reconsider this when resolving #19055.
-        "",
+        getExtensionUniqueName(),
         getAbridgedModules(),
         // repoMappings: The usage of repo mappings by the extension's implementation function is
         // tracked on the level of individual entries and all label attributes are provided as
diff --git a/src/test/py/bazel/bzlmod/bazel_lockfile_test.py b/src/test/py/bazel/bzlmod/bazel_lockfile_test.py
index b4ecccaadae6ab..52fa63a48bbde3 100644
--- a/src/test/py/bazel/bzlmod/bazel_lockfile_test.py
+++ b/src/test/py/bazel/bzlmod/bazel_lockfile_test.py
@@ -2597,6 +2597,62 @@ def testModuleExtensionRerunsOnGetenvChanges(self):
     stderr = '\n'.join(stderr)
     self.assertIn('LAZYEVAL_KEY=None', stderr)
 
+  def testModuleExtensionRerunsOnUniqueNameChange(self):
+    self.ScratchFile(
+        'MODULE.bazel',
+        [
+            'my_ext_1 = use_extension("//:ext1.bzl","my_ext")',
+            'use_repo(my_ext_1, "foo")',
+        ],
+    )
+    self.ScratchFile('BUILD.bazel')
+    self.ScratchFile(
+        'ext1.bzl',
+        [
+            'def _my_repo_impl(ctx):',
+            '  ctx.file("REPO.bazel")',
+            '  ctx.file("BUILD")',
+            '  ctx.file("hi.txt", "hi")',
+            '  if ctx.attr.label:',
+            '    print("label: {}".format(ctx.attr.label))',
+            'my_repo = repository_rule(',
+            '  implementation=_my_repo_impl,',
+            '  attrs={"label": attr.label()}',
+            ')',
+            'def _my_ext_impl(ctx):',
+            '  my_repo(name="foo",label="@bar")',
+            '  my_repo(name="bar")',
+            'my_ext = module_extension(implementation=_my_ext_impl)',
+        ],
+    )
+    self.ScratchFile(
+        'ext2.bzl',
+        [
+            'load(":ext1.bzl", "my_repo")',
+            'def _my_ext_impl(ctx):',
+            '  my_repo(name="foo")',
+            'my_ext = module_extension(implementation=_my_ext_impl)',
+        ],
+    )
+
+    _, _, stderr = self.RunBazel(['build', '@foo//:all'])
+    stderr = '\n'.join(stderr)
+    self.assertIn('label: @@+my_ext+bar//:bar\n', stderr)
+
+    self.ScratchFile(
+        'MODULE.bazel',
+        [
+            'my_ext_2 = use_extension("//:ext2.bzl","my_ext")',
+            'use_repo(my_ext_2, other_foo = "foo")',
+            'my_ext_1 = use_extension("//:ext1.bzl","my_ext")',
+            'use_repo(my_ext_1, "foo")',
+        ],
+    )
+
+    _, _, stderr = self.RunBazel(['build', '@foo//:all'])
+    stderr = '\n'.join(stderr)
+    self.assertIn('label: @@+my_ext2+bar//:bar\n', stderr)
+
 
 if __name__ == '__main__':
   absltest.main()
diff --git a/src/test/tools/bzlmod/MODULE.bazel.lock b/src/test/tools/bzlmod/MODULE.bazel.lock
index d778024982906d..7aeeeb718a4cd0 100644
--- a/src/test/tools/bzlmod/MODULE.bazel.lock
+++ b/src/test/tools/bzlmod/MODULE.bazel.lock
@@ -62,7 +62,7 @@
     "@@platforms//host:extension.bzl%host_platform": {
       "general": {
         "bzlTransitiveDigest": "xelQcPZH8+tmuOHVjL9vDxMnnQNMlwj0SlvgoqBkm4U=",
-        "usagesDigest": "whARuERE2fGO0oER/yUJ9UnuDcSkR227eYWZUVNy/3Y=",
+        "usagesDigest": "BsEIFMvXBOQ6RUjjEzt6CU2+w+vAjFwqp58drqCa2jo=",
         "recordedFileInputs": {},
         "recordedDirentsInputs": {},
         "envVariables": {},
@@ -79,7 +79,7 @@
     "@@rules_jvm_external+//:extensions.bzl%maven": {
       "general": {
         "bzlTransitiveDigest": "tgBpQFC46MaT8n2UeSnG4GNQ8M01bKKTeEWQX+cuoSA=",
-        "usagesDigest": "G7bV9l+zJ2RkplFf3E987nj8RPcxAqfzTHS5Zdc3rZw=",
+        "usagesDigest": "sl3uEZVp3ixjaQzCfAguinRv5zcKQM68YRioCHBX0cE=",
         "recordedFileInputs": {
           "@@rules_jvm_external+//rules_jvm_external_deps_install.json": "10442a5ae27d9ff4c2003e5ab71643bf0d8b48dcf968b4173fa274c3232a8c06"
         },
@@ -1103,7 +1103,7 @@
     "@@rules_jvm_external+//:non-module-deps.bzl%non_module_deps": {
       "general": {
         "bzlTransitiveDigest": "7dxAT2NQpsWXJNV5Sy6o7E78vgRhVEN1vlZdrexTMZY=",
-        "usagesDigest": "Ogn82YkpKa5kvheD/dv6YN0tP3nfvTIqAuPJrebCbWM=",
+        "usagesDigest": "xWSELLxz/xEmLvX/KEddTujJEVrOIQ4j7cs6BkF2J4s=",
         "recordedFileInputs": {},
         "recordedDirentsInputs": {},
         "envVariables": {},
@@ -1131,7 +1131,7 @@
     "@@rules_python+//python/extensions:python.bzl%python": {
       "general": {
         "bzlTransitiveDigest": "z35lvtk23Cj8pA0OHXIWJQ+sP4WORVrujhMDtWGyqo8=",
-        "usagesDigest": "dMk5TOHswAZLEIKE5VenuXubFWbTzMdJplFIkYHPSSU=",
+        "usagesDigest": "tmZ6sMJ23K1YYNMIBcEX0sXPX3I2o7ICQethLTZQvuM=",
         "recordedFileInputs": {},
         "recordedDirentsInputs": {},
         "envVariables": {},
@@ -1161,7 +1161,7 @@
     "@@rules_python+//python/extensions/private:internal_deps.bzl%internal_deps": {
       "general": {
         "bzlTransitiveDigest": "59ucGaK2UFzBbVlrE4x4O1jM4EWKd3zAXRUH63T4j68=",
-        "usagesDigest": "B/G2N6d9Y4VpHFgkQT4wRYFBJ9RP+vFT/Ngiwz7Ejt8=",
+        "usagesDigest": "T+GX/uEOF49O6I6zgLru1E6pJLzL0nzFKcKsMpGGm4I=",
         "recordedFileInputs": {},
         "recordedDirentsInputs": {},
         "envVariables": {},