Docu about Backup Stage on disconnect

Today I was wondering what happens if I do a:

BACKUP STAGE START
BACKUP STAGE BLOCK_COMMIT

And then an exit. This is a common situation with external backup tools (like Veeam) for doing Snapshots.

Documentation did not state anything about it:
https://mariadb.com/kb/en/storage-snapshots-and-backup-stage-commands/
https://mariadb.com/kb/en/mariabackup-and-backup-stage-commands/
https://mariadb.com/kb/en/backup-stage/

Our own experiments showed that a disconnect automatically releases backup stages. This should possibly be mentioned in the docu?

Further we wanted to see in which one the 5 different backup stages we actually are. I did not find a fast way to find this out. Should possibly also be documented?