While I don't disagree that the TP may cause sensor issues the sensors are not that important. There is no need to treat dirty TP as though it were special. Put it in the toilet.
Having human waste in the trash can,dumpsters,landfills where ever is a much bigger issue than keeping tank sensors clean. Your black tank is not going to overflow! Putting your stuff in the trash exposes everyone who handles waste downstream of your trash can for no good reason.......Is the reason to keep sensors clean?!
I never check mt sensors because I am easily good for at least a week.
Putting soiled TP in the trash vs. using a black tank is nasty,unsanitary and ridiculous. If you truly don't want to use the toilet as it was designed use the bath houses.