Warning or Protection for Invalid Items in Deck Creator

Hi! Please consider adding a reminder or warning that invalid items placed in the deck creator will disappear when picked up. Two of my friends accidentally placed their cards and card holders in the deck creator, and they were lost.

It would be really helpful to have either a note reminding players about this or a system that automatically saves invalid items in a separate space that the game can’t access. This way, it won’t affect battles or cause players to lose important items by mistake.

Thank you!