### Godot version

4.0.dev (c309de53997feff3286295fb2d71657f112a15db)

### System information

Linux, Nvidia, Vulkan

### Issue description

Editor segfaults when certain conditions are met when using the AnimationPlayer editor.

### Steps to reproduce

1. Create multiple animations, saved into a animation collection
2. Open an existing animation, then make a new empty animation
3. Change from seconds to fps, or add a new property to animate ()
4. Editor crashes

NOTE: It is slightly random and I have not found a perfect repro

### Minimal reproduction project

N/A (TBD?)
undo_redo->add_do_method(animation.ptr(), "track_insert_key", E->key().track, newpos, animation->track_get_key_value(E->key().track, E->key().key), animation->track_get_key_transition(E->key().track, E->key().key));
			}
			
			for (RBMap<SelectedKey, KeyInfo>::Element *E = selection.back(); E; E = E->prev()) {
				float newpos = NEW_POS(E->get().pos);
				undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", E->key().track, newpos);
			}
			
			for (RBMap<SelectedKey, KeyInfo>::Element *E = selection.back(); E; E = E->prev()) {
				undo_redo->add_undo_method(animation.ptr(), "track_insert_key", E->key().track, E->get().pos, animation->track_get_key_value(E->key().track, E->key().key), animation->track_get_key_transition(E->key().track, E->key().key));
			}
			
			for (_AnimMoveRestore &amr : to_restore) {
				undo_redo->add_undo_method(animation.ptr(), "track_insert_key", amr.track, amr.time, amr.key, amr.transition);
			}
			undo_redo->add_do_method(this, "_clear_selection_for_anim", animation);
			undo_redo->add_undo_method(this, "_clear_selection_for_anim", animation);
			
			for (RBMap<SelectedKey, KeyInfo>::Element *E = selection.back(); E; E = E->prev()) {
				float oldpos = E->get().pos;
				float newpos = NEW_POS(oldpos);
				if (newpos >= 0) {
					undo_redo->add_do_method(this, "_select_at_anim", animation, E->key().track, newpos);
				}
				undo_redo->add_undo_method(this, "_select_at_anim", animation, E->key().track, oldpos);
			}
#undef NEW_POS
			undo_redo->add_do_method(this, "_redraw_tracks");
			undo_redo->add_undo_method(this, "_redraw_tracks");
			undo_redo->commit_action();