mariabackup: unknown option '--no-timestamp'

Our backup tooling has been working well for a long time, until we recently upgraded from 10.5.6 to 10.6.4.

We now get the following error when trying to use the `--no-timestamp` option:

mariabackup: unknown option '--no-timestamp'

The option is only available with the `--innobackupex` option according to the docs, and this option is set. Here is an example command:

mariabackup --backup --target-dir=test2/ --user=backupuser --password=somethinggreat --no-timestamp --innobackupex

Thanks