[BUG] Folding the floating page that was snapped to the edge will make it disappear.

[wwjCMP]

When the floating page is snapped to the edge, clicking this button below will make it disappear, rather than being folded.

[pjeby]

Dunno what causes it, but you can use the command "Restore active hover editor" to restore it (assuming it has focus - you may have to use the keyboard to switch focus to the hover editor first).