Seems that changing any php-files or setup new folders is the workaround, but after updating probably the problem will occur again.
Who has the right solution. I agree, that it could be to do with the php-configuration of the WAMP.
I have seen a lot of paths with user Pxxxx. Seems that they use the same provider.
I have the same probleme with https://www.weber-led.de and my hoster is ready2host using CYCONF.
On an other webspaceprovider with CONFIX it works with my other webadresse. https://www.pyramid-projects.com
I guess it is the PHP-Configuration of the interpreter. But cannot influence it.
Hope for solution soon.