I can't publish content types with template from HUB anymore

We have a Content type HUB for our content types. There is 1 parent and many child content types.

The template library is listed on the same HUB site. The templates are used in the content types. The existing URL is: /sites/contentTypeHub/Templates/[Name of the template].docx.

Everything worked fine until I try to publish an update on 22 may 2025.

The error: 

The operation failed on one or more Metadata web service application proxies: Taxonomy_HrstGnW7grNsmI2m437TvQ==. Please contact your administrator and check the log files for more error details.

Content type publishing list error:

If I try to publish the content type in 'classic SharePoint' I get an access request page. If I fill in this form, I get the acces request myself, because I am site owner. Accept this access request does not help to solve the problem.

Detailed information:

Publication with template = Error, access denied.  Without template, I am able to publish the content type. (But we need the template)

Use of managed metadata field: We use 4 term store sets.

Permissions: I'm site collection admin and site owner of the HUB site. I'm Admin on the term store admin center. I'm site collection owner of the sites where the content types are published. I have full control on the HUB site and all libraries including the template library.

Last successfully published date: 12 may 2025 (With template)

Note: The templates are stored in the template library on the HUB site. They required version history. That's why we don't use the 'upload a template function'. But the function 'use an existing template'. 

Does anyone have any idea to solve this?