Cannot get past SabreDAV 3.1.3 - Digest Authentication does not work anymore.

[jobst]

For years I have been using an old version of SabreDAV, version 1.6.0 - as part of a caldav server.
The caldav server is part of a CRM to give various clients (email/mobile/etc) access to the calendar - this has been working for a long time.
The server sits in the root of the CRM with access to the DB of the CRM.

Over the last couple of weeks I have attempted to upgrade, I have got to version 3.1.3.
Reasons for the upgrade is to get better vobject and make sure my caldav server can deal with PHP upgades (my servers all running > 8.1)

I am using my own PDO backend, I do not need browser access, neither do I need sharing.

While the upgrade was quite tough it's working fine with SabreDAV version < 3.1.3

As soon as I go past 3.2.x I have problems with the DIGEST AUTH - this has been working rather smoothly.
So far I have figured out all other upgraded problems but this one has me stumped.

PHP_AUTH_DIGEST never shows up, the username is not found.

I am stuck, please help.

[jobst]

I tried version 3.2.0 after reading this: #763
Also at the bottom of that it says "evert updated for 3.3" but there is no "3.3"