I've noticed in ver. 25.2.3 of Illustrator, that if I try to edit an already created bevel by clicking on '3D Extrude & Bevel' in the Appearance window, the Bevel: type reverts to 'None' by default when the '3D Extrude & Bevel Options' panel opens. If you don't notice, and complete your edits, and click OK, your bevel reverts to a flat shape. I've been able to recreate this bug on two different computers, so it's not a problem with either machine. Anyone else notice this happening? Very annoying.