### 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)

#define GETCHAR(m_idx) (((char_idx + m_idx) < code.length()) ? code[char_idx + m_idx] : char32_t(0))
	while (true) {
		char_idx++;
		switch (GETCHAR(-1)) {
			case 0:
				return _make_token(TK_EOF);
			case 0xFFFF:
				return _make_token(TK_CURSOR); 
			case '\t':
			case '\r':
			case ' ':
				continue;
			case '\n':
				tk_line++;
				continue;
			case '/': {
				switch (GETCHAR(0)) {