Hello! I'd like to report a peculiar bug: first of all, I wanted to use the filter combinator which worked just fine..until I saved, exited and reloaded the game. After loading the saved game, the filter combinator didn't output any signals anymore, and then when I removed it, I noticed that the sensor entity remained after removing the combinator, and there's no way to delete them..and now I have sensor entities laying around randomly. Could you please help debug this? :)
Here's a screenshot with the lone sensor entity: https://imgur.com/a/74BsYQt

Same issue here.
even worse, that the filter combinator creates several sensor connetors, overlapping, which causes the wire-limit to be reached..

I don't have any problems with entities remaining after deletion, and I discovered that you have to open the settings for the combinator and use the last signal slot to set it to the machine type you want readings for.

I think, i found the issue..
the duplication has to do with mod chganges..
every time, you update or change (add/remove) a mod, the duplication happens..

I've added deduplication to the ingame entity migration a long time ago, so the only way i can imagine, is that some other mod might have destroyed the displayer entity without telling and touching the hidden entities.

Have you tried removing other mods until the bug disappears or does this bug even persists with power combinator enabled only?