Guys Is that so hard to take your demo template and update it to the latest Joomla and get the problem?.. Why I should give you an access to my working project?..
For now I've made a temporary solution to rewrite Joomla core (/vendor) library, but this is not the way in the future update everything gonna be the same also downgrading joomla core libraries automatically opens security holes...
Honestly I wrote you about 1 week ago, I guess many other customers wrote you the same and after one week you are asking the URL to represent the problem?.. Come on guys just fix the bug.