Google Chrome and picture reenabling and reinstalling without authorization or interaction? As somebody really wary of Google in general, the first thing I did on my phone was to disable Chrome and Google Pictures, and replaced them by apps from F-Droid

For a few days now, I've seen them reappear in my app drawer, and with careful observation, the play store seems to be re-enabling and reinstalling them by itself when checking if updates are available.

Uninstalling and disabling them again just kick the can down to the next repository upgrade.

This question talk about google chrome, but do not give an explanation for google pictures.

Auto updates are disabled, android 9.
This was a problem I noticed after updating my OnePlus 6 to Android 10. I didn't get the time to investigate the logs when my Play Store, YouTube, Photos, Play Services and GSF kept re-enabling themselves. One thing I realized was that  if I used a third-party app to disable them they got re-enabled after a while. But if I disabled them using Settings app, they never got re-enabled. This is what I suggest for you.

Also, I keep them blacklisted in my firewall, just to ensure they don't connect to internet even if they manage to re-enable themselves.