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Registered just to share a solution I found. Brand new model Y, factory usb drive but won’t record anything. Turns out had to open up settings page and click recording button (right above sentry button) and a pop up window shows up asking to agree to privacy stuff. After that both dash cam and sentry mode started to work as expected.
I just noticed there is a new (? Hadn't noticed before) "camera -based detection" option in the safety menu.
My M3 also stopped recording regular sentry mode clips at end of 2022: I wonder if this option was added by a recent software update and I did not notice until now (and the default is obviously "off")