### 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 RS::get_singleton()->lightmap_get_probe_capture_points(lightmap);
}
PackedColorArray LightmapGIData::get_capture_sh() const {
	return RS::get_singleton()->lightmap_get_probe_capture_sh(lightmap);
}
PackedInt32Array LightmapGIData::get_capture_tetrahedra() const {
	return RS::get_singleton()->lightmap_get_probe_capture_tetrahedra(lightmap);
}
PackedInt32Array LightmapGIData::get_capture_bsp_tree() const {
	return RS::get_singleton()->lightmap_get_probe_capture_bsp_tree(lightmap);
}
AABB LightmapGIData::get_capture_bounds() const {