### 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)

return ERR_PARSE_ERROR;
			}
			ControlFlowNode *cf = alloc_node<ControlFlowNode>();
			cf->flow_op = FLOW_OP_IF;
#ifdef DEBUG_ENABLED
			keyword_completion_context = CF_IF_DECL;
#endif 
			Node *n = _parse_and_reduce_expression(p_block, p_function_info);
			if (!n) {
				return ERR_PARSE_ERROR;
			}
#ifdef DEBUG_ENABLED
			keyword_completion_context = CF_BLOCK;
#endif 
			if (n->get_datatype() != TYPE_BOOL) {
				_set_error(RTR("Expected a boolean expression."));
				return ERR_PARSE_ERROR;
			}
			tk = _get_token();
			if (tk.type != TK_PARENTHESIS_CLOSE) {
				_set_expected_error(")");
				return ERR_PARSE_ERROR;
			}
			BlockNode *block = alloc_node<BlockNode>();
			block->parent_block = p_block;
			cf->expressions.push_back(n);
			cf->blocks.push_back(block);
			p_block->statements.push_back(cf);
			Error err = _parse_block(block, p_function_info, true, p_can_break, p_can_continue);
			if (err) {