[Peekstra]

@Peekstra Testing out your padding theory, are these the correct numbers for these channels?

• "servicename": "Eventkanaal" - 999
  
• "servicename": "Canvas" - 949
  
• "servicename": "Nick Music" - 304
  
• "servicename": "RTL Crime HD" - 120
  
• "servicename": "Midvliet TV" - 41
  

This would explain why this worked for you in the old version as backend channel number would equal channel count in each group due to the padding channels. 

I can't check it from the office, but according to https://www.ziggo.nl/televisie/zenderoverzicht/ some of them match:

Eventkanaal - matches
Canvas - no match
NickMusic - matches
RTL Crime HD - matches
Midvliet TV - not listed on site. But I can see it on openwebif (without the correct channelnumber).

So that's very close! At he moment, I can VPN to my box but I don't see the channel numbers in openwebif. However, there's a Canvas at the end so I suspect that it might be correct.
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I think that you're probably right about the old plugin getting the numbers this way. 

I don't use autobouquet and all the channels are imported with cablescan.