Sporadic redirect to homeURL after login

[Peter Schober]

* egobrc at gmail.com <egobrc at gmail.com> [2021-04-22 10:56]:
> on my Service Provider I noticed that sometimes, after a successful
> login on the IdP, the user is redirected to "homeURL" URL (the
> attribute is described here:
> https://wiki.shibboleth.net/confluence/display/SP3/ApplicationDefaults
> ) instead of being redirected to the correct application page.
> Sadly this issue happens about one time every 20 logins, it is very
> sporadic and I was not able to reproduce it systematically.

RelayState cookie missing? Browser-specific (e.g. Chrome but
not Firefox)? Maybe SameSite-related?
Just guessing...

-peter