Packet loss after switching to Amazon servers

Hello!
After switching to Amazon servers, I have been experiencing packet loss occasionally, up to 15-16, which makes normal gameplay impossible. What is even stranger is that this issue does not seem to occur in regular matches, only in ranked ones.

My internet service provider insists that everything is fine on their end, but since I believe there is an issue, I need to provide them with the server IPs for verification.

I have tried everything described in help articles and more, but nothing has helped.

When Season 25 was first released, I had an excellent session without any packet loss; however, the next day, the issues resumed.

I am playing on the "eu-central-1" servers.