LDAPS with *.crt Certificate not working with Netbox v4.5.0

[Zombie-Toad]

I just figured out, that our LDAPS config with a *.crt certificate is not working anymore with my upgraded setup and Netbox v4.5.0. I switched to a *.pem certificate and LDAPS is working again. I cannot figure out, what is actually causing the problem.

For testing purpose I switched django-auth-ldap version to 5.2.0, that had no effect. Maybe there is something else causing the problem.

Versions before upgrade (config is working fine):
Debian 12 (latest patches)
Netbox v4.4.9
Python v3.11.2 (from debian repos)

Versions after upgrade (no LDAPS connection):
Debian 13 (latest patches)
Netbox v4.5.0
Python v3.13.5 (from debian repos)

Error message in django ldap log:
Caught LDAPError while authenticating: SERVER_DOWN({'result': -1, 'desc': "Can't contact LDAP server", 'ctrls': []})

Anyone who can replicate this? If so, I would create an issue to update the docs. There is the *.crt file addressed in the LDAP Config (https://netboxlabs.com/docs/netbox/installation/ldap/#general-server-configuration).

EDIT:
Just to be clear, same configuration with "ldap://..." is working fine and certificates are all valid.