standby fails with out-of-order XID insertion

Hi all,
So we have master(pg11.8) and standbyA(pg11.11), 24T data, quite busy
data-warehouse on Amazon Linux.
We've built a standbyB(pg11.11) by creating basebackup from standbyA and
collecting wals from the master.
When basebackup completed we started recovery from collected wals.
When standbyB caught-up we tried to switch to streaming.
1. created slot on the master
2. activated slot (with short pg_receivewal invocation)
3. did a checkpoint on the master (not sure why)
4. cancelled pg_receivewal.
5. stopped the standbyB and started it. Startup fails with
FATAL: out-of-order XID insertion in KnownAssignedXids
More log attached.

after switching back to log-shipping same error occurs.

Any clues why/what is the error ?

Thanks and regards,
Radoslav