I thinks this only concerns native image builds.

Setting either
-XX:MaxDirectMemorySize
or
-Dio.netty.maxDirectMemory
does not work at runtime and runtime memory is incorrectly reflected in io.netty.util.internal.PlatformDependent.DIRECT_MEMORY_LIMIT
at runtime.

i think the problem is that io.netty.buffer.PooledByteBufAllocator uses io.netty.util.internal.PlatformDependent
which is not initialized during runtime but build time.

I tested this with Quarkus 1.10.5.Final, but looking at the current code of NettyProcessor shows that PlatformDependent is still not initialized at runtime, only PooledByteBufAllocator is.