I investigated a bit on this bug.
It seems to correlate with the debug Node "scheduledExcecutables.checkLight.checkedPosition < toCheckCount", which takes up >50% of the entire frame time when the contraption goes over a chunk border.
A Example of this can be found here: https://www.youtube.com/watch?v=af9Cgck1zGA
2x the same setup, once within one chunk, once on a chunk border.
I investigated a bit on this bug.
It seems to correlate with the debug Node "scheduledExcecutables.checkLight.checkedPosition < toCheckCount", which takes up >50% of the entire frame time when the contraption goes over a chunk border.
A Example of this can be found here: https://www.youtube.com/watch?v=af9Cgck1zGA
2x the same setup, once within one chunk, once on a chunk border.