Onfortunately there is a ghost sweep transaction.
There seems to be an issue with my lightnode.
Sometimes is generates ghost sweep transactions of a very old force close which is already solved years ago.
This ghost sweep causes onchain funds not be available
The only thing to solve this till now is a complete rescan of my node with the onchain blockchain putting reset-wallet-transactions=true in lnd.conf.
Sometimes it solves this issue.
So at somepoint I have to do this again and my node is offline again for quite some time. Reporting this bug at github makes no sense due privacy information and it seems it occurs only at my node.