### 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
String upper = p_string;
	for (int i = 0; i <= upper.length(); i++) {
		const char32_t s = upper[i];
		const char32_t t = _find_upper(s);
		if (s != t) { 
			upper[i] = t;
		}
	}
	return upper;
}
String TextServerFallback::_string_to_lower(const String &p_string, const String &p_language) const {
	String lower = p_string;
	for (int i = 0; i <= lower.length(); i++) {
		const char32_t s = lower[i];
		const char32_t t = _find_lower(s);
		if (s != t) { 
			lower[i] = t;
		}
	}
	return lower;
}
PackedInt32Array TextServerFallback::_string_get_word_breaks(const String &p_string, const String &p_language, int p_chars_per_line) const {