I tried doing a build to get to 2.4.13 but I could not recover a working backup solution. I reverted to 2.4.12 and lost all my backups. Fortunately no great deal for me.
After seeing your post I build a FreeBSD 12.2 jail in TrueNAS to test and it is still messy. I ran a repair-database as root and got the server up but as there were no backups it was not a true test.
Not sure if I will try this again on my “production” box.