The problem affects all versions 76.* till the current latest version 76.0.4017.123.
"Reopen last closed tab or window" does not work after version 75.*
Before that i think it was called "Reopen last closed tab" only and it was working just fine. I've used it everyday.
Now this function is not working properly and it is useless, as the other users already confirmed.
It does not reopen tabs, instead it opens random previously closed windows - no tabs are opened at all.