@joeyh are you sure it's the SSD, rather than the RAM or filesystem causing metadata weirdness?
my best clue on this is that so far, every affected file is a file that dpkg would touch, and a majority of them are /var/lib/dpkg/info files
(bearing in mind that I've seen dpkg make assumptions that broke btrfs long ago, although I'm using ext4 and would not really expect such breakage with it)
@samis it's a whole different laptop than last time. Maybe a kernel bug?