Cannot use BigPipe and Still Add Comments

I ran into this myself just now on 10.2.0 FWIW. It was a D9 site that had the core big_pipe and comment modules installed, with commenting enabled. Updated to 10.2.0 and the comment form disappeared. Uninstalling big_pipe fixed it.

Changed Drupal version to 10.2.0 since I encountered this on that version just now.

Have you tried 10.2.1? There is a relevant bug fix there, 🐛 big_pipe sometimes fails to load blocks Active

Otherwise are there any errors in the browser JavaScript console when this happens?

no JS errors on my end but it was consistently not rendering the comment form block. Looks like the issue has been resolved on 10.2.x-dev ( https://www.drupal.org/project/drupal/issues/3390178 🐛 big_pipe sometimes fails to load blocks Active ) though.. I will check with the next release

That bug fix is in 10.2.1.

I updated to 10.2.1 but that did not fix my issue. When I have BigPipe installed, my comment form consistently does not show - every time. No JS errors. Just this HTML gets rendered:

<span data-big-pipe-placeholder-id="callback=comment.lazy_builders%3ArenderForm&amp;args%5B0%5D=node&amp;args%5B1%5D=19040&amp;args%5B2%5D=field_comment&amp;args%5B3%5D=blog_comment&amp;token=GIszGpkYD5yzHH572vPlvi8RJYjjHj4MmaakxGwnAKE">
</span>

I realize this is precious little to go on, but felt it's important to point out even if I am a lone voice in the wilderness here (it may help someone else). I'm fine with just uninstalling BigPipe as a stopgap solution; that's how I solved it for myself, but it's a shame to have to do that.

I'm not sure if this is a comment module or big_pipe module issue and didn't want to pollute https://www.drupal.org/project/drupal/issues/3390178 🐛 big_pipe sometimes fails to load blocks Active with this issue (since it's marked fixed), so I thought I'd post here first. I changed the status from 'Duplicate' to 'Needs work' for now since I don't think this is a duplicate.