There is an unaddressed problem in the TextMate grammar that was brought over from Atom in Feb. 2020 (see file history for the grammar-file, Asciidoctor.json)).

As it stands, the regex in the #quote-paragraph rule will not match any block-attribute-list that contains, itself, an inline macro -- such as a URL macro or a bibliographic-citation macro. Downstream from that rule, there are weaknesses also in the #block-attribute-inner rule. The regex-fixes I'm going to show in a PR here (in just a minute) are the upshot of an earlier discussion of the whole matter, still viewable in Atom PR 197 -- where also there are screen-shots and syntax-examples; please see this earlier discussion for details.

(Sadly, that discussion was started almost 2 years after the grammar was ported here from Atom... Too bad I was barking up the wrong tree... Atom instead of VS Code! :-|)

This problem remains as of v. 3.1.3. Implementing them in that version, I've tested these fixes that I'm going to submit in my PR. The system information is:

Version: 1.79.2 (system setup)
Commit: 695af097c7bd098fbf017ce3ac85e09bbc5dda06
Date: 2023-06-14T08:57:04.379Z
Electron: 22.5.7
Chromium: 108.0.5359.215
Node.js: 16.17.1
V8: 10.8.168.25-electron.0
OS: Windows_NT x64 10.0.19045