It works with the java version of HotSpot (Oracle) (OpenJDK14U-jre_x64_windows_hotspot_14.0.2_12)
But it doesnt work with the virtual machine of openj9 (OpenJDK14U-jre_x64_windows_openj9_14.0.2_12_openj9-0.21.0)
It worked perfectly until one of the lastest pre-releases.
(Where i download the java versions: https://adoptopenjdk.net/index.html?variant=openjdk14&jvmVariant=hotspot)
Duplicate of reopened MC-197271 - please explain on that report how this is a bug with Minecraft and not with OpenJ9.