Hi,
this is indeed a problem - and known since a short time.
Long story short: The DexGuard obfuscator we use at the moment supports gradle up to version 3.6.4.
The current release will fail even with 3.6.4 I think (not 100% sure here); we are close to releasing an update that is
a) fully Android 10 compatible and
b) fixes the gradle issue to a certain degree (up to 3.6.4).
But even with the next release (scheduled in roughly 3 to 4 weeks) I don't believe gradle 4.X will work unless we get a DexGuard update before (warranty is fine - so we kinda wait for this ourselves).
I may have more information on this within the next week - but can't say for sure.
Regards
Nico