Non-superuser roles get 503 error using lister

[Robin S]

When attempting to change the field dropdown on any lister (e.g. Users section, Find), users with a non-superuser role just get a spinner.

Looking in the browser console I can see:

.../access/users/?InputfieldSelector=opval&field=name&type=&name=filters
503 (Service Unavailable)

The role has the page-lister permission. Superuser can use the listers normally.

Any ideas what can cause this?

[Robin S]

Tracked the problem down to any field roles field having access restrictions for the role.

It's possible to get the listers working again by checking the "Make field value accessible from API even if not viewable" option, but still seems like a bug to me so issue filed at GitHub.

Edit: perhaps not a serious bug now I have discovered the issue only stems from access restriction on the roles field.