I was surprised to find that my Oasis 2 installed a new firmware version over-the-air today, even though I had already installed 5.9.5.2 from
Kindle Oasis (9th Generation) Software Updates.
Looking further I found the the version on the website is 5.9.5.2 (3301990004), but the one that just installed is 5.9.5.2 (3307390005).
The What's New description is the same. I wonder what changed.