Async mode broken with neovim 0.12

[opatut]

I upgraded from NVIM 0.11.7 to NVIM 0.12.1 recently, and since then :Ags is broken.

• The first command call does not produce anything.
• Starting with the second command call, I only get back No matches for: xxx
• Setting let g:ags_enable_async=0 fixes the issue, but is obviously not really desirable for large projects etc.
• Searching with an explicit directory, such as :Ags foo src/ or even :Ags foo ., also gives me results.

I have a hard time with vimscript, but if there is something I can assist with for debugging, I'm happy to help.