When it breaks™. Basically each new version you need to check if the file was changed.
You can go on Gitea to see the last modification dates and see what changed by looking at the commit message.
Each release has two pages. A list of major changes and a small porting guide.
https://gitea.wildfiregames.com/0ad/0ad/wiki/Alpha27
You can help by enriching the later
https://gitea.wildfiregames.com/0ad/0ad/wiki/PortA26ToA27
Every errors are logged in a file called interestinglog.html
See this page for where to find it https://gitea.wildfiregames.com/0ad/0ad/wiki/GameDataPaths
This file is wiped on each game start.