Did you make sure you have several GBs of free memory on the device while patching? At least until recently, ReVanced Manager would throw an error if it ran out of memory, and it actually needed (if I recall correctly) around 8 GB of free memory in order to finish the patching process or it’d throw one of several errors, depending on where in the process it ran out of memory.

Supposedly they’ve fixed this issue with the latest update to ReVanced Manager, which included a new patching process, but I haven’t had a chance to test it.