### 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 (tex->detect_3d_callback && p_use_linear_color) {
						tex->detect_3d_callback(tex->detect_3d_callback_ud);
					}
					if (tex->detect_normal_callback && (p_texture_uniforms[i].hint == ShaderLanguage::ShaderNode::Uniform::HINT_NORMAL || p_texture_uniforms[i].hint == ShaderLanguage::ShaderNode::Uniform::HINT_ROUGHNESS_NORMAL)) {
						if (p_texture_uniforms[i].hint == ShaderLanguage::ShaderNode::Uniform::HINT_ROUGHNESS_NORMAL) {
							normal_detect_texture = tex;
						}
						tex->detect_normal_callback(tex->detect_normal_callback_ud);
					}
					if (tex->detect_roughness_callback && (p_texture_uniforms[i].hint >= ShaderLanguage::ShaderNode::Uniform::HINT_ROUGHNESS_R || p_texture_uniforms[i].hint <= ShaderLanguage::ShaderNode::Uniform::HINT_ROUGHNESS_GRAY)) {
						
						roughness_detect_texture = tex;
						roughness_channel = RS::TextureDetectRoughnessChannel(p_texture_uniforms[i].hint - ShaderLanguage::ShaderNode::Uniform::HINT_ROUGHNESS_R);
					}
					if (tex->render_target) {
						tex->render_target->was_used = true;
						render_target_cache.push_back(tex->render_target);
					}
#endif
				}
				if (rd_texture.is_null()) {
					rd_texture = texture_storage->texture_rd_get_default(TextureStorage::DEFAULT_RD_TEXTURE_WHITE);
				}
#ifdef TOOLS_ENABLED
				if (roughness_detect_texture && normal_detect_texture && !normal_detect_texture->path.is_empty()) {
					roughness_detect_texture->detect_roughness_callback(roughness_detect_texture->detect_roughness_callback_ud, normal_detect_texture->path, roughness_channel);
				}
#endif
				p_textures[k++] = rd_texture;
			}