It does appear to be a similar issue, but not helpful as the comments are from 4 years ago and no solution has been provided.
I agree with @sakthi_dev. These are not the same issues. The sticky css problem is in Claro in core. Here is the issue: https://www.drupal.org/project/drupal/issues/3362276 📌 Use position: sticky for views sticky table header Fixed
The actual css is in /core/themes/claro/css/components/tableselect.css. Change the "top" property to "0" seems to solve the problem, but there's a longer discussion going on at that issue above: "To javascript or not to javascript".
.position-sticky thead {
top: 0;
}The 2.1.0 minified version is not the same as the unminified version. Need to reminify. See attached patch.
Had the same issue plus we incorporate Workbench in our installation, which we originally thought could be part of the problem but wasn't.
This solve worked for us with seemingly no implications: check the "Access the content blocks overview page. Get an overview all content blocks." It's near the bottom of "Block Content" on the permissions page (admin/people/permissions).