### 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 (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_CONTINUE) {
			if (!p_can_continue) {
				_set_error(vformat(RTR("'%s' is not allowed outside of a loop."), "continue"));
				return ERR_PARSE_ERROR;
			}
			ControlFlowNode *flow = alloc_node<ControlFlowNode>();
			flow->flow_op = FLOW_OP_CONTINUE;
			pos = _get_tkpos();
			tk = _get_token();
			if (tk.type != TK_SEMICOLON) {
				
				_set_expected_after_error(";", "continue");
				return ERR_PARSE_ERROR;
			}
			p_block->statements.push_back(flow);
		} else {
			
			_set_tkpos(pos); 
			Node *expr = _parse_and_reduce_expression(p_block, p_function_info);
			if (!expr) {
				return ERR_PARSE_ERROR;
			}
			is_condition = expr->type == Node::NODE_TYPE_OPERATOR && expr->get_datatype() == TYPE_BOOL;
			if (expr->type == Node::NODE_TYPE_OPERATOR) {
				OperatorNode *op = static_cast<OperatorNode *>(expr);