java.base.jmod increased by an order of magnitude in the JDK11/17 April 2023 quarterly release.
 
For example:
 
$ ll java-11-openjdk-11.0.18.0.10-1.portable.jdk.el.x86_64/jmods/java.base.jmod
rw-rr-. 1 user user 21375701 Jan 12 23:49 java-11-openjdk-11.0.18.0.10-1.portable.jdk.el.x86_64/jmods/java.base.jmod
$ ll java-11-openjdk-11.0.19.0.7-1.portable.jdk.el.x86_64/jmods/java.base.jmod
rw-rr-. 1 user user 264863673 Apr 13 23:18 java-11-openjdk-11.0.19.0.7-1.portable.jdk.el.x86_64/jmods/java.base.jmod

This was an intentional change to streamline the build process (build once on RHEL7 and repackage for other RHELs).

However, should some post-processing be added to strip them out of the portable build at the end?