Cannot configure layout or edit content when using Layout Builder

Problem/Motivation

I cannot configure the layout or edit the content on a page that is using Layout Builder. No options appear when I click on any of the following links: "Add section", "Add block", "Configure Body", or "Configure" within a section. A blue wait icon does show briefly to the right of the links after clicking on it.

I believe it is a theme issue because it worked when I changed the theme to Olivero. It stopped working when I changed it back. I just upgraded to 3.9.0, but had the same results using version 3.8.1.

I'm not sure when this issue started but it was working fine for years until I just noticed it recently.

I receive the same results when:

• The deprecated module "Layout Builder Expose All Field Blocks" is enabled or disabled
• "Create new revision" is enabled or disabled

I also verified the following:

• Use contextual links is checked for user permissions.
• Under Layout options for that content type, "Use Layout Builder" is checked as well as "Allow each content item to have its layout customized"
  

  Steps to reproduce

  • Enable Layout Builder
  • Under Manage Display for a content type enable Layout Builder and check "Allow each content item to have its layout customized"
  • Visit a page that uses that content type and click on "Layout"
  • Click on "Add Section" or any other link
  • No dialog box or options appear

  Maybe it's something on my end or I'm missing something. I appreciate any help or looking into it.