Aggregation onCompleted does not open XA transaction

Since Camel 3 version.

The aggregation processor doesn't open a XA transaction when the aggregation is completed or timed-out.

If the aggregated route destination is a XA resource camel throw the following exception :

Session's XAResource has not been enlisted in a distributed transaction 

I create 2 projects with one test.

One in camel 3.18.2 which is failing and one with camel 2.25.4 which is successful.