### 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 (!arg_name.is_empty()) {
							calltip += " ";
							calltip += arg_name;
						}
						if (i == completion_argument) {
							calltip += char32_t(0xFFFF);
						}
						found_arg = true;
					}
					if (found_arg) {
						calltip += " ";
					}
					calltip += ")";
				}
				idx++;
			}
			r_call_hint = calltip;
			return OK;
		} break;
		case COMPLETION_INDEX: {
			const char colv[4] = { 'r', 'g', 'b', 'a' };
			const char coordv[4] = { 'x', 'y', 'z', 'w' };
			const char coordt[4] = { 's', 't', 'p', 'q' };
			int limit = 0;
			switch (completion_base) {
				case TYPE_BVEC2:
				case TYPE_IVEC2:
				case TYPE_UVEC2:
				case TYPE_VEC2: {
					limit = 2;