Papermerge: Running manage.py fails with no such env, possible solution?

Trying to run the manage.py in papermerge to backup/restore the database per documentation @ https://papermerge.readthedocs.io/en/latest/backup_restore.html.

/app/papermerge/manage.py fails with
/usr/bin/env: ‘python’: No such file or directory

I have ‘fixed’ this by creating a symlink for python in /usr/bin to point to /usr/bin/python3

Can you fix this in the next release? I couldn’t find a JIRA or other ticketing system for linuxserver.io containers.