Hi Aleksei, Which version of Photoshop are you using? I tried with 2019 and two layers named "Layer 1". The export yielded "Layer 1.png" and "Layer 1-1.png". If you can share an example file, that would help greatly.
I came across missing assets several times during last year or more, the issue always was in asset names. It seems last time it exported as you said, so maybe it was fixed already or the problem is different.