@valdiusryb @Graham1 As a counter measure you can disable persist match settings. See the following video. Note that it means your settings will be reset at each match.
VIDEO_PERSIST.mp4
@valdiusryb Do you have any mods ? If so disable them. If that doesn't work delete your matchsettings.json file. Check the FAQ for more info https://trac.wildfiregames.com/wiki/FAQ
The game supports running out of the box with the -writableRoot flag. What you can do is backup your old 0 A.D. install, then install the new one. This way you can have both coexisting.