To reproduce in the attached save file:
- Right click on the equipped armor
- Left click on the portable solar panel to select it
- Left click into one of the armor slots
I expected the interface to armor to behave the same way as chests or other inventories.
I shared the save game in discord, and another player was able to reproduce this on their own machine. As far as I can tell, this hasn't been reported in the forums, on reddit, or in discord.