The "layer" on the timeline in Photoshop disappears, although everything is fine without the included timeline, what's the matter?

Question

Adobe Photoshop

On the 13th frame, the mo-feng layer becomes empty, and on 16 it returns again (on 14 and 15 it is also empty), but the reason for this is not at all clear to me, because before that I did not do any manipulations, but without the time scale everything is completely normal .

Answer 1

I suspect that you just deleted the content of the layer on this frame. Try to create it again, by default it will be on all frames

Answer 2

And, of course, as soon as I discovered this (i.e. immediately), I immediately canceled all possible actions and removed the timeline, opened essentially clean files again, but nothing changed, the same layer, the same frames, no logical reason.