Expanded diff sections have odd syntax highlighing #35252
Description
Example: https://gitea.com/gitea/blog/commit/bbc33fd7e7abea738fc23d3174bb6b20d08ab943
The JSON keys here have incorrect syntax class s2, should have nt. So far I only have seen this problem in JSON. Other languages like go worked fine.
Tested on main branch and issue is there as well.
