(BG) Synergy bug between Rylak Metalhead and Gem Smuggler

I encountered an issue during my last Battlegrounds match, and I believe it’s a game bug (I can provide a screenshot if needed):

I was playing Rylak Metalhead, positioned to the right of Gem Smuggler. However, my cards were taking blood gems during the turn but returning to the tavern without retaining them. Is this a game bug or a translation/rule error for the card? (My game is in French)

I also had a Brann Bronzebeard and a second Rylak Metalhead positioned to the right of Golden Moon-Bacon Jazzer. Here, the blood gems retained their stats after the combat turn.

I’m a bit frustrated with the outcome of my game; I thought the cards would scale tremendously.

Looking forward to hearing from you.

Any buff given to your minions during the combat phase is temporary and will be removed back in recruit phase, unless explicitely written that it will be permanent.