Hi Volker,
Please find the below response.
Query 1: Query (WHERE) not working
We are also facing this problem. We have logged bug report on this. You can track the status of this through the following feedback link.
The fix will be included in our volume 2 main release which is expected to roll out on June 29, 2020.
Query 2: I can't even pass any parameters using Key as a work-around, it does not arise in CustomController's Read method
In our SfDataManager, we don’t have property called Key. We handled it for internal cases only. So can you please tell us for which use case you used Key property? It will very helpful to achieve your requirement asap.
Please let us know if you need further details on this.
Regards,
Logeswari G