Ok, well, maybe the problem is not solved…
After placing the file back I did manage to get the heap increase, but after removing I it doesn’t stop anymore.
This might mean the root cause wasn’t the invalid channel, but there is something else. Perhaps I was to fast with concluding.
Still have a RPI3B doing nothing, will install this one with a fresh openhabian image and import my configuration towards there. This to excluded it is caused by any configuration issue/bug. Think I can exclude any of the bindings since I’ve removed them all 1 by 1, including all things disabled.
Maybe my system is damaged ‘somewhere’ which isn’t overwritten by updating or switching from milestone to stable.