About point 01 “Optimization of resources in XRNI instrument load” for multiple tracks
New: The particularly problem is FX Chain in position “None”, is the cause of sounds cut in multiple tracks, also. "None"not savethis problem in multiple tracks. Force to remove FX Chain in Instrument XRNI. In “None”,It should not be aproblem.Perhaps this could be improved.
Instrument XRNI problem sound: FX Chain in “None” in multiple Tracks
5981 
This has been discussed here:https://forum.renoise.com/t/can-you-change-instruments-in-tracks/44221
Thanks to pat for help!