I have tried to look into the issue manually but couldn't find the error you're describing.
I can see the error in the message area, but not on the element itself, moreover dumping errors variable from details.twig returns null (see screenshot). Could you give me a hint if I'm missing out on anything?
Edited pattern and added replacing of the new lines.
\Drupal\Tests\system\Functional\Mail\HtmlToTextTest passes for me locally.
But on the build this one fails:
1) Drupal\Tests\comment\Functional\CommentPreviewTest::testCommentPreview
Failed asserting that '3' is an instance of interface
"Drupal\Component\Render\MarkupInterface".
skipper-vp β made their first commit to this issueβs fork.
A patch out of MR so that it can be used until it's merged.
Rerolled patch for 8.x-3.21, which is still actively used.
I have rerolled the patch from #8 for Alpha3 version of the module.
larowlan β credited skipper-vp β .