Thanks! I think found the character vanish thing, i can reproduce the bug.
its the frametime going really high because of resize/dragging the window. I've fixed that by skipping frames with high frametimes.
if you can post the vid on a onedrive/google drive and share a link to it here i can watch it.
still not sure where the no jump bug comes from i can't seem to trigger it.
if i maximize the window before the enter i can still jump.