Version: refinedstorage-0.7.19

When breaking an interface with upgrades, the upgrades are not dropped and are lost. I thought this could be a problem in general but then I broke my solderer that had 4 speed upgrades and they were dropped. I went ahead and tested the following: Importer, Exporter, Constructor, Destructor, and Wireless transmitter and they all drop their upgrades when broken. So the problem seems to be isolated to the Interface.