I have already contacted support immediately, but so far I have not received any response. The address of the wallet that would receive the ETH is this: 0x8dc90e5a147e12ad8dd007b8306f0102fb81595c
I couldn't find any pending transactions

Not in this one, only in the wallet you sent GOLD tokens from, there is one pending transaction befor you send GOLD to marketplace
this is why there is chance it was stuck
have you seen in Marketplace that your transaction was received and processed further?
If this is the case there is info provide all details just after it is received/sent