@Broddy2026 Hi there and welcome to the forum.
Your case, in my own personal view, is yet another case whereby play was continued BEFORE the FULL bonus winning amount has been completely paid out to you by the casino.
Several other similar cases have been brought forward here in this forum but I can't really remember the outcome of each case.
The way I see it (just my personal opinion of course), you should have withdrawn that 478 EUR first as well , wait for all the outstanding amount to be paid out in full, then only make a new deposit to play, free from any of the previous bonus restrictions.
There's a clause that requires the bonus winnings to be withdrawn first, then only can a new deposit be made to continue playing without the previous bonus restrictions.
This may be the case with your winnings, but that's just my opinion.