I think I do have a similar issue:

$ snap list
Name  Version    Rev   Developer  Notes
core  16-2.26.9  2381  canonical  -

$ sudo snap remove core
error: cannot remove "core": snap "core" is not removable

$ df
...
/dev/loop1                      82432    82432         0  100% /snap/core/2381
...

$ sudo umount /snap/core/2381

$ sudo snap remove core
core removed

Maybe this helps?

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https://bugs.launchpad.net/bugs/1589210

Title:
  snap remove "core" on classic not allowed

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