This is still working but since the last update there is a sync.ffs_lock file left behind every time this runs.
There are warnings in the log:
[06:32:33] Warning: Cannot set directory locks for the following folders:
Cannot read file attributes of "H:\sync.ffs_lock".
Error Code 5: Access is denied. [GetFileAttributesEx]
[06:32:33] Info: Comparison finished: 25 items found
[06:32:33] Info: Synchronizing folder pair: Mirror->
[06:32:33] Info: Creating file "B:\Hassio\2b5cb12f.tar"