Posting here in case anyone else has the same problem so I can share the solution.

With Schall Remains & Pickup installed Trashteroids drop an unusable and (without recyclers) undeletable shield module.
equpment-name.trashteroid-shield

I was able to fix this locally by adding "trashsteroid-grid" to the schall remains "exclude grid" setting of Remains and Pickup.

I've made a request to add "trashsteroid-grid" to the default list of excluded grids but schallfake's last activity was 10 months ago so I'm not sure how soon they'll respond. Until then hopefully anyone with the same issue will find this thread.
https://mods.factorio.com/mod/SchallRemainsPickup/discussion/690a6fd987ebd49f151c6304

Now I need to figure out what to do with several dozen asteroid shield generators.
Thank you for your time.

Thank you for the report. I will see if I can maybe even have a cleaner general solution by giving the shield items a 2 tick spoil time.

Oooh, that's a really clever solution and would definitely be appreciated.

It is now out in Rubia v0.69.122