I've just submitted an update to one of my games to Google Play, and they've flagged it with an error about an implicit PendingIntent. They provided this link for more information: https://support.google.com/faqs/answer/10437428
They say fixing this is not mandatory, but recommended.
I haven't seen this before, and I'm using the same Gideros version I used for the last release of this game (version 2021.11) so evidently this is something Google has recently started detecting and reporting. I see many cases where PendingIntents are created in IAB, etc, but I haven't looked into it enough to know which are implicit. I also haven't checked to see if this is an issue with newer builds.