### Godot version

4.0.3

### System information

Win7

### Issue description

![image](https://github.com/godotengine/godot/assets/28286958/abec9d3c-e078-424c-9430-d9fe8897aad6)


### Steps to reproduce

1. Create shader
2. Add uint with hex, e.g. 0xffffu

### Minimal reproduction project

N/A
expression_block->use_comma_between_statements = true;
			cf->blocks.push_back(expression_block);
			err = _parse_block(expression_block, p_function_info, true, false, false);
			if (err != OK) {
				return err;
			}
			BlockNode *block = alloc_node<BlockNode>();
			block->parent_block = init_block;
			cf->blocks.push_back(block);
			p_block->statements.push_back(cf);
#ifdef DEBUG_ENABLED
			keyword_completion_context = CF_BLOCK;
#endif 
			err = _parse_block(block, p_function_info, true, true, true);
			if (err != OK) {
				return err;
			}
		} else if (tk.type == TK_CF_RETURN) {
			
			BlockNode *b = p_block;
			while (b && !b->parent_function) {
				b = b->parent_block;
			}
			if (!b) {
				_set_parsing_error();
				return ERR_BUG;
			}
			if (b->parent_function && p_function_info.main_function) {
				_set_error(vformat(RTR("Using '%s' in the '%s' processor function is incorrect."), "return", b->parent_function->name));
				return ERR_PARSE_ERROR;