### Godot version

4.0 beta 17

### System information

Windows 11, Forward+, RTX 4090

### Issue description

In the latest beta, baking LightmapGI has taken a big performance hit. The baking itself might not be the problem, it's the (Re)Importing Assets step for the `.exr` that seems to take all the time.




### Steps to reproduce

I've included a repro project to demonstrate it. Click the `LightmapGI` node and then the `Bake Lightmaps` button.

Before Beta 17:
`Done baking lightmaps in 00:00:01.`

With Beta 17 (and the latest Master branch, just in case):
`Done baking lightmaps in 00:00:08.`



### Minimal reproduction project

[lightmap-regression-repro.zip](https://github.com/godotengine/godot/files/10579835/lightmap-regression-repro.zip)

return light_data;
}
void LightmapGI::set_bake_quality(BakeQuality p_quality) {
	bake_quality = p_quality;
}
LightmapGI::BakeQuality LightmapGI::get_bake_quality() const {
	return bake_quality;
}
AABB LightmapGI::get_aabb() const {
	return AABB();
}
void LightmapGI::set_use_denoiser(bool p_enable) {
	use_denoiser = p_enable;
}
bool LightmapGI::is_using_denoiser() const {
	return use_denoiser;
}
void LightmapGI::set_directional(bool p_enable) {
	directional = p_enable;
}
bool LightmapGI::is_directional() const {
	return directional;
}
void LightmapGI::set_interior(bool p_enable) {
	interior = p_enable;
}
bool LightmapGI::is_interior() const {