QUIC doesn't work with PHP 7.2RC6 with LiteSpeed SAPI

QUIC is not working in PHP 7.2.0RC6 and reverting to HTTP/2 when using the Litespeed SAPI. We don't know why this is. PHP believes this may be the final verison of 7.2.0. The problem does not exist with the latest stable version of PHP 71.11. No settings changed in Litespeed. This has been reported under bug fix #331905. Litespeed version is 5.2.2 (build 3)