fwiw i found found the git option git-enable-magit-delta-plugin t to more or less result in utter chaos a lot of the time, can't recommend it.
What theme have you found works best? Maybe i could switch to it when i use the git status buffer.
I commented the variable and no longer use delta for the diffs. It didnt add much for me. Also if the theme changes whist in Magit Status, then you have to quit magit status and restart it to apply the theme change. I use doom-gruvbox themes and the dark version does not work well with the delta theme. The doom-gruvbox light is okay, but nothing spectacular.
It depends on the Emacs theme used as to how useful delta is. That variable is already commented, so is optimal. If you don't have delta installed, then it affects the magit status view (because it has no diff tool to execute and doesn't seem to fall back to the normal diff)