Found the problem. The migration file from Extended Transport contains 4 JSON objects instead of 1 (https://gist.github.com/anonymous/27053d485bae46744bbeadcdf0ace659). The game seems to be executing the first one and ignoring the other 3.

Merging the 4 json objects into 1 object with 4 keys fixed ...

Found the problem. The migration file contained 4 json objects instead of 1. The game executed the first one and ignored the other 3. I'll report the problem to the developer.

I'm having problems with a mod I'm using, and being a developer myself I thought I'd try to debug the issue (it's a reasonably popular mod and no one else reported it, so I suspect something might be off in my save/game).

The problem is quite simple: the mod has a .json migration because a few ...

I'm having problems upgrading from .14 to .15. The migrations don't seem to run or are not working... and as a result I'm losing all items that have been renamed (e.g. stone walls and locomotives).

Has anyone else ran into this problem? Any tip?