Complete loss of any syntax highlighting in VS 2026 and Insiders

Release 3117 and release 3123 have lost color highlighting in VS.
VS 2022 still works ok.
I have to revert back to 3111 to get the normal albeit limited syntax highlighting in VS.
I noticed it in 3117 and was hoping the next release would address the issue. But it didn’t.
I might like to hope some work was being done on the correction of inconsistent type highlighting that was logged a while ago. Maybe that’s the reason? Or maybe something simpler?