With layout builder (core experimental module) and Bootstrap theme enabled, drag & drop and contextual links don't work on layout pages. Contextual links and drag & drop do work with Bartik theme.
Steps to reproduce:
1. Install Drupal 8.5.6
2. Enable Layout Builder module
3. Edit the basic page content type and enable “Allow each content item to have its layout customized.” - /admin/structure/types/manage/page/display
4. Add a basic page
5. Go to the layout tab on that page
6. Add the “Powered by Drupal” block
7. The “Powered by Drupal” block is draggable and it’s contextual link is available
8. Install bootstrap 8.x-3.12 theme and set it as default.
9. Go back to the layout tab on your basic page
10. The “Powered by Drupal” block is NOT draggable and it’s contextual link is not available
11. Set Bartik as the default theme again
12. Go back to the layout tab on your basic page
13. The “Powered by Drupal” block is draggable and it’s contextual link is available
Active
3.0
Documentation
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This theme will not be supported for Bootstrap 4. See alternative themes for this support.
This issue also applies to bootstrap 3.x
A workaround is to use this module
https://www.drupal.org/project/layout_builder_admin_theme →
To select a theme other than bootstrap to manage your layout_builder . With that said, I'm interested to learn about a better solution.