Display More.. I had to switch back to 8.7.3 when everything was good.
in the mean time It came out that something may change depending by the time there is between two Program Change Messages.
in my case it must be at least 2 sec for not having the second Sound to be Late.
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the last answer of my #support-ticket is ''our engineering si working on improvements. Watch out for the next revision, probably 8.7.6''
Let's wait, but 8.7.3 is ok right now. I don't have any issue right now
Ok thanks for your reply. I might also switch back to 8.7.3. That version worked also perfect for me.