### 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)

if (switch_type != TYPE_INT && switch_type != TYPE_UINT) {
					_set_error(RTR("Expected an integer expression."));
					return ERR_PARSE_ERROR;
				}
			}
			tk = _get_token();
			if (tk.type != TK_PARENTHESIS_CLOSE) {
				_set_expected_error(")");
				return ERR_PARSE_ERROR;
			}
			tk = _get_token();
			if (tk.type != TK_CURLY_BRACKET_OPEN) {
				_set_expected_after_error("{", "switch");
				return ERR_PARSE_ERROR;
			}
			BlockNode *switch_block = alloc_node<BlockNode>();
			switch_block->block_type = BlockNode::BLOCK_TYPE_SWITCH;
			switch_block->parent_block = p_block;
			cf->expressions.push_back(n);
			cf->blocks.push_back(switch_block);
			p_block->statements.push_back(cf);
			int prev_type = TK_CF_CASE;
			while (true) { 
				if (_parse_block(switch_block, p_function_info, true, true, false) != OK) {
					return ERR_PARSE_ERROR;
				}
				pos = _get_tkpos();
				tk = _get_token();
				if (tk.type == TK_CF_CASE || tk.type == TK_CF_DEFAULT) {
					if (prev_type == TK_CF_DEFAULT) {