I have a query that runs with 9.3.1 and fails with 9.4.0.CR2 with NPE:

15:22:40,145 DEBUG [org.infinispan.query.remote.impl.QueryFacadeImpl] (HotRod-ServerHandler-6-12) Error executing remote query : null: java.lang.NullPointerException
at org.infinispan.query.remote.impl.QuerySerializers.getSerializer(QuerySerializers.java:19)
at org.infinispan.query.remote.impl.BaseRemoteQueryManager.decodeQueryRequest(BaseRemoteQueryManager.java:63)
at org.infinispan.query.remote.impl.QueryFacadeImpl.query(QueryFacadeImpl.java:44)
at org.infinispan.server.hotrod.HotRodServer.query(HotRodServer.java:148)
at org.infinispan.server.hotrod.CacheRequestProcessor.queryInternal(CacheRequestProcessor.java:493)
at org.infinispan.server.hotrod.CacheRequestProcessor.lambda$query$31(CacheRequestProcessor.java:488)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)

.proto model seems registered correctly
query is very simple: from sample_bank_account.User
using old hotrod 2.4