Apparently, solved the problem. But in that case, the pages with v parameter would not be cached, right? And I want the pages to be cached, because all pages have now the parameter v.
Exactly. This happens because the first access after flush the cache was in DE (Germany).
The option “Cache URIs with query string variables” in Performance > Page Cache is enabled.
The problem is related with the cache of the first redirect.
I can show you my screen.
Can we schedule a quick call (google meet) to discuss this issue?