Powershell syntax highlighting lost

I’ve got a Gitlab install that’s mostly used for Powershell scripts. At some point it stopped applying syntax highlighting on ps1 files. Python files have highlighting still however. Is this due to the change of the highlighting library?

[Edit to add] I don’t know when it stopped working but it’s still not working in 7.10.0.

I am targeting pushing my fork rugments (which is used for highlighting in gitlab) back to upstream. There is somebody working on a powershell lexer: