diff --git a/internal/postprocessor/main.go b/internal/postprocessor/main.go
index 97a9fbdaaa62..c8a8cbaa1d68 100644
--- a/internal/postprocessor/main.go
+++ b/internal/postprocessor/main.go
@@ -499,7 +499,7 @@ func (p *postProcessor) processCommit(title, body string) (string, string, error
 			// When OwlBot generates the commit body, after commit titles it provides 'Source-Link's.
 			// The source-link pointing to the googleapis/googleapis repo commit allows us to extract
 			// hash and find files changed in order to identify the commit's scope.
-			if strings.Contains(line, "googleapis/googleapis/") {
+			if strings.HasPrefix(line, "Source-Link") && strings.Contains(line, "googleapis/googleapis/") {
 				hash := extractHashFromLine(line)
 				scopes, err := p.getScopesFromGoogleapisCommitHash(hash)
 				if err != nil {
diff --git a/internal/postprocessor/testdata/nested-commits.input b/internal/postprocessor/testdata/nested-commits.input
index 272829e8d9ea..2d5a403df2c5 100644
--- a/internal/postprocessor/testdata/nested-commits.input
+++ b/internal/postprocessor/testdata/nested-commits.input
@@ -27,4 +27,17 @@ Source-Link: https://togithub.com/googleapis/googleapis/commit/488a4bdeebf9c7f50
 
 Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/5b3d3a550015e9367ad13ee5f9febe0c3f84cf33
 Copy-Tag: eyJwIjoiamF2YS1iYXRjaC8uT3dsQm90LnlhbWwiLCJoIjoiNWIzZDNhNTUwMDE1ZTkzNjdhZDEzZWU1ZjlmZWJlMGMzZjg0Y2YzMyJ9
+END_NESTED_COMMIT
+
+BEGIN_NESTED_COMMIT
+fix(datacatalog): Change field behavior of the property "name" to IDENTIFIER
+
+The solution follows guidelines from https://google.aip.dev/203#identifier and https://github.com/googleapis/googleapis/blob/master/google/api/field_behavior.proto#L91-L103.
+
+PiperOrigin-RevId: 596643040
+
+Source-Link: https://togithub.com/googleapis/googleapis/commit/3c84a3ca7d480cb6e09dc1e8f1bc4a77d03cac82
+
+Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/4c4a9f43f4a4f7d87c931c121e0bd0fbd6392468
+Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNGM0YTlmNDNmNGE0ZjdkODdjOTMxYzEyMWUwYmQwZmJkNjM5MjQ2OCJ9
 END_NESTED_COMMIT
\ No newline at end of file
diff --git a/internal/postprocessor/testdata/nested-commits.output b/internal/postprocessor/testdata/nested-commits.output
index 0a7506914337..79a2a3b26aed 100644
--- a/internal/postprocessor/testdata/nested-commits.output
+++ b/internal/postprocessor/testdata/nested-commits.output
@@ -26,4 +26,16 @@ Source-Link: https://togithub.com/googleapis/googleapis/commit/488a4bdeebf9c7f50
 
 Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/5b3d3a550015e9367ad13ee5f9febe0c3f84cf33
 Copy-Tag: eyJwIjoiamF2YS1iYXRjaC8uT3dsQm90LnlhbWwiLCJoIjoiNWIzZDNhNTUwMDE1ZTkzNjdhZDEzZWU1ZjlmZWJlMGMzZjg0Y2YzMyJ9
+END_NESTED_COMMIT
+BEGIN_NESTED_COMMIT
+fix(datacatalog): Change field behavior of the property "name" to IDENTIFIER
+
+The solution follows guidelines from https://google.aip.dev/203#identifier and https://github.com/googleapis/googleapis/blob/master/google/api/field_behavior.proto#L91-L103.
+
+PiperOrigin-RevId: 596643040
+
+Source-Link: https://togithub.com/googleapis/googleapis/commit/3c84a3ca7d480cb6e09dc1e8f1bc4a77d03cac82
+
+Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/4c4a9f43f4a4f7d87c931c121e0bd0fbd6392468
+Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNGM0YTlmNDNmNGE0ZjdkODdjOTMxYzEyMWUwYmQwZmJkNjM5MjQ2OCJ9
 END_NESTED_COMMIT
\ No newline at end of file