Inline links no longer highlighted when complete

[abers]

I recently upgraded to Ubuntu 19.04 and the inline link behaviour with vim-pandoc syntax seems to have broken.
Previously:
example of [link text](link)
Would show "link text" in red and "link" in blue or conceal "(link)" if:
let g:pandoc#syntax#conceal#urls=1
However, now "link text" will appear red whilst typing until the "]" is added, at which point it turns back to the default text colour. Any idea how to restore the previous behaviour?

Side-note: What lines would I need to edit if I wanted to change the syntax highlighting to make the "link text" underlined blue and the square brackets and "(link)" concealed?

Edit: Appears to be a change in vim-pandoc-syntax rather than issue created by upgrading to Ubuntu 19.04. Issue reproduced on vim on Windows Subsystem for Linux.

[TheCedarPrince]

I can also confirm this happening on Fedora and Vim 8+.