JDK-8187450 half-fixed the issue on Windows; the warning is now absent when running with -Djava.net.preferIPv4Stack=true, but still present otherwise.

Example test output from test\jdk\java\net\NetworkInterface\Test.java:

WARNING: JNI local refs: 33, exceeds capacity: 32
at java.net.NetworkInterface.getAll(java.base@20-internal/Native Method)
at java.net.NetworkInterface.getNetworkInterfaces(java.base@20-internal/NetworkInterface.java:353)
at Test.main(Test.java:42)
...