[Bug] Does not work well in Rmarkdown code chunk

[shaman-yellow]

Config:

let g:rainbow_conf = {
      \ 'separately': {
      \ 'rmd': {
      \ 'parentheses_options': 'containedin=rmdrInline,@Rmdr contained',
      \ },
      \ 'nerdtree': 0,
      \ }
      \ }

Some results:

The syntax of rmd.vim can found in https://github.com/jalvesaq/R-Vim-runtime

[luochen1990]

Can you check which syntax rules the brackets on lines 73 and 77 are matched with using the tools described in the
troubleshooting section of README? I suspect that a keyword syntax rule is overriding the rainbow rules