Compilation against a modular, multi-release JAR erroneous with --release

ADDITIONAL SYSTEM INFORMATION :
This is reproducible on recent builds of Java 9-13 (including 11.0.5 and the latest 11.0.6 build).

A DESCRIPTION OF THE PROBLEM :
When compiling against a multi-release JAR with a module-info class in a version specific subdirectory, compilation works fine as of JDK-8156568. However, when compiling against a specific version using the "--release" flag, javac seems to categorize the MRJAR on the module path as automatic module.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
A MCVE is available here: https://github.com/TheMrMilchmann/MCVE/tree/jdk/javac-modular-mrjar-dep-automatic-module-warning


FREQUENCY : always