Topic on PCGamingWiki talk:Sample article
I forgot where exactly I found it, I think it was somewhere in the PCGW wiki or Discord, but it seems not included in the editing guide or anywhere else visible, but the best idea would be to launch the game with XDG_CONFIG_HOME=/tmp/pcgw (after creating a folder first) or similar and then report back.
There's also an XDG_DATA_DIRS
though, and there's often inconsistency on how games place save files or similar data in config and other in data files. I've been thinking about solving it and I think the field should be used separately for config and saves, as one can be followed and the other might not.