I think I’ve just accidentally fixed this. Noticed that systemctl status showed Tainted: unmerged-bin:var-run-bad, where var-run-bad means /var/run is not a symlink to /run (the unmerged-bin warning is unrelated afaict). No idea how this happened. So I rebooted in safe mode, made a backup of /var/run just in case, and made it a link to /run. Snaps telegram-desktop and juju can now refresh in strict mode.
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