Org. Post out of Ger Forum:https://www.arcgames.com/de/forums/fwde#/discussion/132318/beim-kombinieren-alles-weg
Player did step up from Lv3 Gems to Lv4 several times. No Problems.
Lv4 to Lv5 Gems FAIL. Everything as well known, 5 Gems + Agent = 100% = FAIL all is gone.
Someone else have this experience ?
Btw. Ticket to Support did not work for him / her.