### Godot version

4.1.0

### System information

Windows 10, i711800H, Forward+ Vulkan

### Issue description

When using @export_group("Name") in a BaseClass, then inheriting from that BaseClass in another class and there also using @export_group("Name"), with the same group name, then running the project and re-saving the inherited class the project crashes with 
```
ERROR: FATAL: Index p_index = 3 is out of bounds (size() = 3).
   at: get (./core/templates/cowdata.h:155)
```

sometimes the editor crashes too after a while.

### Steps to reproduce

1. open reproduction project
2. Run the project.
3. Open the "super"script
4. Press CTRL + S to save it.

### Minimal reproduction project

[MRP_.zip](https://github.com/godotengine/godot/files/12137412/MRP_.zip)

gen->write_call_utility(type, "typeof", typeof_args);
				
				
				for (int j = 0; j < match->branches.size(); j++) {
					if (j > 0) {
						
						gen->write_else();
					}
					const GDScriptParser::MatchBranchNode *branch = match->branches[j];
					codegen.start_block(); 
					
					List<GDScriptCodeGenerator::Address> branch_locals = _add_locals_in_block(codegen, branch->block);
#ifdef DEBUG_ENABLED
					
					gen->write_newline(branch->start_line);
#endif
					
					GDScriptCodeGenerator::Address pattern_result = codegen.add_temporary();
					for (int k = 0; k < branch->patterns.size(); k++) {
						pattern_result = _parse_match_pattern(codegen, err, branch->patterns[k], value, type, pattern_result, k == 0, false);
						if (err != OK) {
							return err;
						}
					}
					
					gen->write_if(pattern_result);
					
					gen->pop_temporary();
					
					err = _parse_block(codegen, branch->block, false);