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Actually, scrap down.
Went to Firefox+Tapermonkey. It worked fine.
Went back to Chrome, removed Tapermonkey, installed Violentmonkey. It works there correct, too. I guess Chrome+Tapermonkey got broken at some point.
It was working fine few months ago, but today I was surprised - using those hotkeys, incorrect images are opened. Not sure if its' script issue, or pinterest introduced some awkward change.
Example link https://www.pinterest.co.uk/pin/646125877783783259/
Z/Shift+Z'ing it opens an image that's different than on pinterest thumbnail - I also noticed that the opened photo is the same as next small thumbnail under main thumbnail on pinterest (so if you have large 1 thumbnail and bunch of small thumbnails below, script will open 1st small thumbnail under main one.)