Vimtex error with vim-pandoc-syntax

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When trying to open a pandoc flavored markdown file [pandoc.markdown] an Error detected while processing function is shown.

Minimal vimrc

call plug#begin('~/.config/nvim/plugged')
Plug 'lervag/vimtex'
Plug 'vim-pandoc/vim-pandoc-syntax'
call plug#end()

augroup pandoc_syntax
	au! BufNewFile,BufFilePre,BufRead *.md set filetype=markdown.pandoc
augroup END

Reproduce the issue

vim -u init.vim test.md

Even tried with vim-plugs lazy loading feature, same issue.

---

Reversing back to commit b292c2a seems to fix the issue. I have tried reverting back to some commits in vim-pandoc-syntax, while keeping vimtex at current head (b4fc8ae), but the problem still remained.

[lervag]

I believe this is fixed now. I'll figure out another way of doing what I wanted to do. Thanks for the detailed issue report, it will be helpful for testing!

[listout]

Thank you