https://mail.openjdk.org/pipermail/jmc-dev/2023-December/005823.html
https://github.com/openjdk/jmc/pull/539 

The IOToolkit.openUncompressedStream utility in JMC only seems to decompress streams which support mark/reset, returning the input otherwise. Within JMC this seems not to cause any issues because the input is usually a file, however using this functionality as a library produces unexpected behavior where compressed recordings appear corrupted.

The work is being done by GitHub user @carterkozak, I've assigned this issue to myself as a placeholder.