### 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 bounds;
}
bool LightmapGIData::is_interior() const {
	return interior;
}
float LightmapGIData::get_baked_exposure() const {
	return baked_exposure;
}
void LightmapGIData::_set_probe_data(const Dictionary &p_data) {
	ERR_FAIL_COND(!p_data.has("bounds"));
	ERR_FAIL_COND(!p_data.has("points"));
	ERR_FAIL_COND(!p_data.has("tetrahedra"));
	ERR_FAIL_COND(!p_data.has("bsp"));
	ERR_FAIL_COND(!p_data.has("sh"));
	ERR_FAIL_COND(!p_data.has("interior"));
	ERR_FAIL_COND(!p_data.has("baked_exposure"));
	set_capture_data(p_data["bounds"], p_data["interior"], p_data["points"], p_data["sh"], p_data["tetrahedra"], p_data["bsp"], p_data["baked_exposure"]);
}
Dictionary LightmapGIData::_get_probe_data() const {
	Dictionary d;
	d["bounds"] = get_capture_bounds();
	d["points"] = get_capture_points();
	d["tetrahedra"] = get_capture_tetrahedra();
	d["bsp"] = get_capture_bsp_tree();
	d["sh"] = get_capture_sh();
	d["interior"] = is_interior();
	d["baked_exposure"] = get_baked_exposure();
	return d;
}
void LightmapGIData::_bind_methods() {