Thanks! That page gets me 'Session contents could not be read?' as a result, and my own misadventures get me ['Unexpected character in line 1 column 1 of json file.'] which makes me think the lz4ing got an EOF or such boundary metacharacter right in ...
With version 132.0.1 I found that all my tabs disappeared (failed to load, really. The debt of open tabs database fell down I imagine, I only have 16 GiB on this laptop, it starts to open windows and flashes a bit lik background things are happening ...