Can't access NFS shares that have snapshots

I have just discovered that some of my nfs shares are no longer accessible. The ones affected are those I have a scheduled snapshot task for. I have read the wiki detailing how you can’t rollback a snapshot while exported as a share, but I haven’t tried that and they previously worked.

Checking the web-UI scheduled tasks page, recent snapshots have failed with an unspecified “error”. Digging into journalctl, I only see:

-- The start-up result is done.
Feb 13 01:15:01 [myhostname] CROND[24965]: (root) CMD (/opt/rockstor/bin/st-snapshot 3 \*-*-*-*-*-*)
Feb 13 01:15:03 [myhostname] systemd[1]: Removed slice User Slice of root.
-- Subject: Unit user-0.slice has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

If I try to delete the NFS share, the following error occurs:
2020-02-15_10-54

If I try to delete either a snapshot from the schedule (read-only) or a manually created writeable snapshot, that doesn’t work either:
2020-02-15_10-54

So it seems I’m stuck in a bit of a loop. The “failed” snapshots started around 2 weeks ago, so I wonder if part of the issue is related to "You are running Setuptools on Python 2, which is no longer supported"

Any ideas how to move forward with this?