These problems were reported against the packager that Johan Vos backported for OpenJDK 11.

The jpackager command line should have the flag --release in addition to
--version. The only way to set a different release than "1" is to supply a
custom spec file for RPM and control file for DEB.
package/linux/test.spec
Version: 1.0.0
Release: RC1
package/linux/control
Version: 1.0.0-RC1

Need to add cli option "--linux-app-release <value>" to satisfy the request.