[midPoint] CsvConnector 2.8 can't load users because of nullvalue

[Gomringer Michael]

Dear all

I'm struggling with a very simple CSV Connector 2.8 in midpoint 4.9.3.
Any import task ends in an error: "Value of attribute '__NAME__' must be a single value, but it has nullvalues".
The tolerance on the mappings is set to "undefined", as written in an older thread that it shouldn't be on "false" [1], and I tried it already with "true" but that didn't help.
The connection to the csv can be established and the schema can be loaded. I down stripped the CSV to two lines only, UTF-8 encoded, everything in quotes, etc.
The only difference to the training-setup is the version (2.8 now vs. 2.7. in training) where the configuration was very simple and worked directly.
Attached is the xml of the csv-connector as well as an anonymized version of the CSV which ends in the same error and a log from the midpoint-container of the import-task.
I'm new to midpoint and we're waiting for a subscription. Please tell me if I need to provide any additional information. Help much appreciated.

Many thanks and cheers,
Gomi

[1] https://lists.evolveum.com/pipermail/midpoint/2020-June/006291.html
[Ai Powered Innovation] <https://www.ti8m.com>
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