If you don't make any transactions in your breez wallet for a long time, your LN channels may close. I had a 400k sat transaction stuck in there like that for a few months, until I got fed up and asked AI what to do about it. She advised me to leave the app running for at least 15 minutes so it wouldn't go into background running and could sync properly. After I did that, after a few minutes an exclamation point appeared in the upper right corner in a triangle. When I clicked on it, I was able to enter the onchain address I wanted to withdraw my stuck bitcoins to and the transaction finally took place, so if you have a similar problem, leave the app open until you can enter the onchain address to complete the transaction.