The Claro theme outputs the markup around textareas differently than the Seven theme does. The web/core/themes/claro/templates/text-format-wrapper.html.twig twig template uses the same class as the textarea, because they're applying the patch here:
https://www.drupal.org/node/3016343 →
This means we get a duplicate counter after these elements AND that the ckeditor counter doesn't work.
1. Enable the Claro theme
2. Create a Textarea with CKeditor enabled.
3. In the form display, add a counter.
4. When you edit the page, you see two counters and adding characters doesn't work.
Update the javascript to fix these two things without breaking other admin themes, like seven.
Fixed
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Thanks! The patch from Comment #11 fixed the duplicate counters.
Issue #3182675 by mariacha1, swirt, amklose, AkshayAdhav, manuel.adan,...