[mythtvnz] XMLTV ID deleting after mythfilldatabase

[Curtis Walker]

So things were running well for a few weeks, then this week I noticed
I only had 4 days of guide data.

I checked my guide data source (https://nzxmltv.com/xmltv/guide.xml) -
all good, downloads fine.

In mythtv-setup, I see that the problem is that all my channel xmltv
ID's had been reset to numbers i.e. 1 for tvnz1.freeviewnz.tv, 2 for
tvnz2.freeviewnz.tv, 3 for three.freeviewnz.tv etc.

Using mythtv-setup, I edited a few of them back again, but on running
mythfilldatabase, they revert back to numbers again.

Any idea what could be causing this?