Building Upgrade Icon Remains After Upgrade

I selected a bunch of assemblies to upgrade from tier I to Tier II. And I noticed that after they were all upgraded, three icons remained. I've never seen this happen before.

Thanks for reporting this! I can't quite find repro steps at the moment.
If you find any repro steps, or a save in which it is present and it remains after load, that could be helpful!

Here you go.

This one is in a different spot. It's the pipe on my quartz/sand mine train station.