Now I use B4A 11.8 with resources_06_21.zip, but the extras SDK is a little out dated.
ex. the play-services-base is 17.6.0 , but the newest version is 18.1.0 in google maven.
I will meet more version issues if use the B4A SDK manager to update one package. I guess the B4A SDK manager don't check and update dependency (.pom file).
I wish a new version B4A with updated SDK , Maybe it will need more effort.
This is indeed not recommended. The resources are upgraded from time to time.
It is not trivial to update the complete package due to incompatibilities between the many many resources.