Please demonstrate to me that it works just with WordPress categories and without Toolset installed on the site.
If that works, then we can investigate why it doesn't work with custom taxonomies created with Toolset.
I'm sure you will appreciate, if it does not work when Toolset is not installed on the site then we cannot be expected to fix it.
If you create a test using more than 100 categories and it works, then I'll be happy to investigate why it doesn't work with Toolset custom taxonomies, and I can bring in a developer to help pin down the issue if required.
To re-iterate what I wrote in the last thread, you can easily generate 100s of test categories with the FakerPress plugin.
- For your test you should start with a clean WP install with no plugins installed.
- Add the FakerPress plugin
- Go to FakerPress > Terms and use the settings you can see in the screenshot to generate 300 dummy categories
- Go to Posts > Add New to add a new post
- Open the Categories dropdown in the sidebar and see how many categories are included
(It would be a good idea before performing the last step to open the Network requests tab of your browser dev tools, which will let you see the requests made, as in the screenshot I shared in the other posts, which shows a single request for the categories when there should be 3, given that there are 300 categories to be retrieved 100 at a time.)
If you need help setting up the test or verifying whether it works or not, let me know and I'll make sure I've got up-to-date site credentials from you and check.
It's important that you perform this test with no plugins installed (except FakerPress, which you can disable once the categories have been generated).
If the test fails, then the only people who can help you are your hosting company, and opening new threads here is not a productive use of your time or ours.
If the test succeeds, and Toolset is required to reproduce the issue, then we'll do whatever is needed to identify the problem.