Problem shading Beam pipeline with Beam 2.20.0-SNAPSHOT

I was checking today a pipeline against the latest 2.20.0-SNAPSHOT and I found that it works perfectly with version 2.19.0, but it is failing with a  shade related exception that refers to grpc 1.26.0:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:3.2.1:shade (default) on project EventsToIOs: Error creating shaded jar: Problem shading JAR /home/ismael/.m2/repository/org/apache/beam/beam-vendor-grpc-1_26_0/0.1/beam-vendor-grpc-1_26_0-0.1.jar entry org/apache/beam/vendor/grpc/v1p26p0/org/jboss/modules/Main.class: org.apache.maven.plugin.MojoExecutionException: Error in ASM processing class org/apache/beam/vendor/grpc/v1p26p0/org/jboss/modules/Main.class: 65536 -> [Help 1]

There is also a warning that is not present in the build against 2.19.0

[WARNING] Discovered module-info.class. Shading will break its strong encapsulation.

I wonder if we are not doing something wrong during our vendoring, can someone take a look please.

This is relatively easy to reproduce with the beam-samples repo, just clone it and run:

git clone https://github.com/jbonofre/beam-samples
mvn clean verify -Pbeam-release-repo -Dbeam.version=2.20.0-SNAPSHOT

Available logs of the latest run:

https://github.com/jbonofre/beam-samples/runs/427537544?check_suite_focus=true