5c9dc83bb909a07e830f0364ba65e0fe0d59b230
It seems Vim needs to be instructed how to scan for the begining of the multiline statements to correctly and efficiently highlight lanuages. See :help syn-sync-maxlines
Languages
Nix
95%
Shell
2%
Python
1.8%
Rust
0.3%
JavaScript
0.2%
Other
0.4%