diff --git a/modules/gdscript/editor/gdscript_highlighter.cpp b/modules/gdscript/editor/gdscript_highlighter.cpp
index 144dd41f1a1..8dbd262b22b 100644
--- a/modules/gdscript/editor/gdscript_highlighter.cpp
+++ b/modules/gdscript/editor/gdscript_highlighter.cpp
@@ -907,6 +907,8 @@ void GDScriptSyntaxHighlighter::add_color_region(const String &p_start_key, cons
 		ERR_FAIL_COND_MSG(color_regions[i].start_key == p_start_key, "color region with start key '" + p_start_key + "' already exists.");
 		if (p_start_key.length() < color_regions[i].start_key.length()) {
 			at++;
+		} else {
+			break;
 		}
 	}
 
diff --git a/scene/gui/code_edit.cpp b/scene/gui/code_edit.cpp
index 40c276e4e04..291d578add1 100644
--- a/scene/gui/code_edit.cpp
+++ b/scene/gui/code_edit.cpp
@@ -2862,7 +2862,8 @@ void CodeEdit::_update_code_region_tags() {
 		return;
 	}
 
-	for (int i = 0; i < delimiters.size(); i++) {
+	// A shorter delimiter has higher priority.
+	for (int i = delimiters.size() - 1; i >= 0; i--) {
 		if (delimiters[i].type != DelimiterType::TYPE_COMMENT) {
 			continue;
 		}
@@ -3104,6 +3105,8 @@ void CodeEdit::_add_delimiter(const String &p_start_key, const String &p_end_key
 		ERR_FAIL_COND_MSG(delimiters[i].start_key == p_start_key, "delimiter with start key '" + p_start_key + "' already exists.");
 		if (p_start_key.length() < delimiters[i].start_key.length()) {
 			at++;
+		} else {
+			break;
 		}
 	}
 
diff --git a/tests/scene/test_code_edit.h b/tests/scene/test_code_edit.h
index e69ac448e4c..c3a374b5cdf 100644
--- a/tests/scene/test_code_edit.h
+++ b/tests/scene/test_code_edit.h
@@ -2944,15 +2944,15 @@ TEST_CASE("[SceneTree][CodeEdit] region folding") {
 		CHECK(code_edit->is_line_code_region_end(2));
 
 		// Update code region delimiter when removing comment delimiter.
-		code_edit->set_text("//region region_name\nline2\n//endregion\n#region region_name\nline2\n#endregion");
+		code_edit->set_text("#region region_name\nline2\n#endregion\n//region region_name\nline2\n//endregion");
 		code_edit->clear_comment_delimiters();
 		code_edit->add_comment_delimiter("//", "");
-		code_edit->add_comment_delimiter("#", "");
+		code_edit->add_comment_delimiter("#", ""); // A shorter delimiter has higher priority.
 		CHECK(code_edit->is_line_code_region_start(0));
 		CHECK(code_edit->is_line_code_region_end(2));
 		CHECK_FALSE(code_edit->is_line_code_region_start(3));
 		CHECK_FALSE(code_edit->is_line_code_region_end(5));
-		code_edit->remove_comment_delimiter("//");
+		code_edit->remove_comment_delimiter("#");
 		CHECK_FALSE(code_edit->is_line_code_region_start(0));
 		CHECK_FALSE(code_edit->is_line_code_region_end(2));
 		CHECK(code_edit->is_line_code_region_start(3));