### Godot version

4.0 dev Beta 10

### System information

MacBook Pro M1 Max

### Issue description

After I imported font.ttf file and move it from one folder to another under ://res godot suddenly crashed, and it still crashes after restart.

### Steps to reproduce

Import some font.ttf file and try to move into different folder

### Minimal reproduction project

N/A
FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND_V(!fd, SUBPIXEL_POSITIONING_DISABLED);
	MutexLock lock(fd->mutex);
	return fd->subpixel_positioning;
}
void TextServerFallback::_font_set_embolden(const RID &p_font_rid, double p_strength) {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND(!fd);
	MutexLock lock(fd->mutex);
	if (fd->embolden != p_strength) {
		_font_clear_cache(fd);
		fd->embolden = p_strength;
	}
}
double TextServerFallback::_font_get_embolden(const RID &p_font_rid) const {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND_V(!fd, 0.0);
	MutexLock lock(fd->mutex);
	return fd->embolden;
}
void TextServerFallback::_font_set_transform(const RID &p_font_rid, const Transform2D &p_transform) {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND(!fd);
	MutexLock lock(fd->mutex);
	if (fd->transform != p_transform) {
		_font_clear_cache(fd);
		fd->transform = p_transform;
	}
}
Transform2D TextServerFallback::_font_get_transform(const RID &p_font_rid) const {