Duplicate attributes after upgrade to Shibboleth 5

[Peter Schober]

Equbay Kiflay via users <users at shibboleth.net> [2025-02-04 18:35 CET]:
> We upgraded our Shibboleth IdP from 4.3 to 5.1.2 ad then to 5.1.3
> [...]
> The issue being that Shibboleth is now releasing duplicate values for
> attributes.

https://shibboleth.net/pipermail/users/2020-September/047964.html

HTH,
-peter