### Godot version

4.0.stable

### System information

Windows 10, Forward+, GTX 1070 driver 528.49

### Issue description

When trying to edit the handle mode of a bezier cruve key from the inspector tab, the mode doesn't change. It works fine when right clicking on the key and setting the handle mode from here though. 

https://user-images.githubusercontent.com/24484962/222379540-29d71b6d-ff0c-4a21-9905-9750d0581fda.mp4



### Steps to reproduce

On an animation track using a bezier curve, select a key and try to change the handle mode from the inspector tab

### Minimal reproduction project

N/A
hscroll->share(timeline);
	hscroll->hide();
	hscroll->connect("value_changed", callable_mp(this, &AnimationTrackEditor::_update_scroll));
	timeline_vbox->add_child(hscroll);
	timeline->set_hscroll(hscroll);
	track_vbox = memnew(VBoxContainer);
	scroll->add_child(track_vbox);
	track_vbox->set_h_size_flags(SIZE_EXPAND_FILL);
	scroll->set_horizontal_scroll_mode(ScrollContainer::SCROLL_MODE_DISABLED);
	track_vbox->add_theme_constant_override("separation", 0);
	HBoxContainer *bottom_hb = memnew(HBoxContainer);
	add_child(bottom_hb);
	imported_anim_warning = memnew(Button);
	imported_anim_warning->hide();
	imported_anim_warning->set_text(TTR("Imported Scene"));
	imported_anim_warning->set_tooltip_text(TTR("Warning: Editing imported animation"));
	imported_anim_warning->connect("pressed", callable_mp(this, &AnimationTrackEditor::_show_imported_anim_warning));
	bottom_hb->add_child(imported_anim_warning);
	dummy_player_warning = memnew(Button);
	dummy_player_warning->hide();
	dummy_player_warning->set_text(TTR("Dummy Player"));
	dummy_player_warning->set_tooltip_text(TTR("Warning: Editing dummy AnimationPlayer"));
	dummy_player_warning->connect("pressed", callable_mp(this, &AnimationTrackEditor::_show_dummy_player_warning));
	bottom_hb->add_child(dummy_player_warning);
	inactive_player_warning = memnew(Button);
	inactive_player_warning->hide();
	inactive_player_warning->set_text(TTR("Inactive Player"));
	inactive_player_warning->set_tooltip_text(TTR("Warning: AnimationPlayer is inactive"));
	inactive_player_warning->connect("pressed", callable_mp(this, &AnimationTrackEditor::_show_inactive_player_warning));
	bottom_hb->add_child(inactive_player_warning);