[Highlight] partially broken within `tpope/vim-markdown` fenced code

[Huxpro]

vim-markdown supports fenced code highlight with in markdown.
the problem is that vim-scala syntax works well for filetype=scala but partially broken inside filetype=markdown.

It's reproducible for code like object ID { or def Foo() {.
I assumed it's something related to brackets since adding // } would revoke highlights below this line.

I think it might related to the dynamics of vim-scala/syntax here:

exe 'syn region scalaBlock start=/{/ end=/}/ contains=' . s:ContainedGroup() . ' fold'

I am not sure what's the problem so I fired issues on both side:
vim-markdown: tpope/vim-markdown#142
vim-scala: #157

[benknoble]

@Huxpro why did you close the issues? Did you resolve it somehow?

[ches]

Can still reproduce this on current master, so I'll re-open.

[Huxpro]

@benknoble I thought no one is maintaining and interested in this lol. Thx for reopening.