### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

}
				tk = _get_token();
				if (tk.type != TK_SEMICOLON) {
					_set_expected_after_error(";", "return");
					return ERR_PARSE_ERROR;
				}
#ifdef DEBUG_ENABLED
				if (b->parent_function->return_type == DataType::TYPE_BOOL) {
					keyword_completion_context = CF_BLOCK;
				}
#endif 
				flow->expressions.push_back(expr);
			}
			p_block->statements.push_back(flow);
			BlockNode *block = p_block;
			while (block) {
				if (block->block_type == BlockNode::BLOCK_TYPE_CASE || block->block_type == BlockNode::BLOCK_TYPE_DEFAULT) {
					return OK;
				}
				block = block->parent_block;
			}
		} else if (tk.type == TK_CF_DISCARD) {
			
			BlockNode *b = p_block;
			while (b && !b->parent_function) {
				b = b->parent_block;
			}
			if (!b) {
				_set_parsing_error();
				return ERR_BUG;