I managed to replicate this workaround. As soon as I saw the spinning circle I immediately closed the app (from the recent apps screen). When I logged back in the training blessing, I placed on my base, was back in my inventory and the troop retrain icon was still there.I don't know if this was a fluke because I haven't replicated it yet. I've also lost troops on a few occasions but this last time I placed an instant retrain blessing and as soon as I got the spinning circle I immediately closed the app - via the 'recent app' screen. I opened the game again and my retrain icon was still there and the instant retrain was back in my inventory. I placed it on my base again and everything worked as normal.
Hope this helps.
maybe your workaround is working in this special case. But often the problem appears while blessing is active for e.g. 30min -> closing game will not bring it back to inventoryI managed to replicate this workaround. As soon as I saw the spinning circle I immediately closed the app (from the recent apps screen). When I logged back in the training blessing, I placed on my base, was back in my inventory and the troop retrain icon was still there.
Placed the blessing back on my base and retrained again without a problem.
Ouch - that would hurt. I've never had that - only when placing for the first time.maybe your workaround is working in this special case. But often the problem appears while blessing is active for e.g. 30min -> closing game will not bring it back to inventory