It's been a long time since I had to do something similar, so memory is spotty.
Check this: https://learn.microsoft.com/en-us/troubleshoot/mem/configmgr/content-management/understand-package-actions
But I (think) there is possibly a file either in your inboxes\PkgTransferMgr.box, or inboxes\distmgr.box (??).
Look at the files in there, and one of them will be 'that package instruction file'. I think you can just delete it; otherwise you may need to first stop the SMS component for distribution_manager, then delete that instruction file? (so you can re-distribute, after fixing the source).
Otherwise... if you are watching the distmgr.log, you can likely tell that it's on "attempt 20 of 100" (or whatever), and if it's on attempt 99 of 100, just wait it out until it 'fails', and then re-distribute after it fails.