I use K-9 Mail (aka Thunderbird Mobile) on my phone, installed via #FDroid. Last week, K-9 showed up in the list of pending updates in the Google Play Store, despite it not having installed that apk, and not being able to update it (and it wants to install the same version as is already installed). I can't clear it from the "pending updates" list. Unfortunately this seems to be a new #Android Play Store bug (see forum.f-droid.org/t/google-pla…). Reported to Google.

@IzzyOnDroid have you had any experience with this bug?

Google Play Store tries to update my F-Droid apps :-(

Some days ago, the Google Play Store started to list F-Droid apps as outdated. These are apps that exist on both, the Play Store and F-Droid. Naturally, the Play Store fails to update these apps due to a signature mismatch.

^{F-Droid Forum}