Why TCP connections drops in Frankfurt eu-central-1 even though same connections work without a problem in Stockholm (eu-north-1)

Steps to reproduce: Create EC2 instance in eu-central-1 region with following configuration - t3.small, ami-042172eb88687b43e (Windows Server 2016 Base), Public IP, igw to handle traffic. Login to the instance through RDP. Install telnet (it can be done through PowerShell with following command Install-WindowsFeature -name Telnet-Client). Open command line and try use telnet to connect 10-20 times to remote host with following command telnet 212.90.186.150 80. At least one attempt will fail with error "Connection failed". Repeat all steps above in eu-north-1 region and will see 0 errors.

Is there a problem with routing in eu-central-1 region?

You can also trace (tracert 212.90.186.150) to find out through which IPs/Networks the connection goes. From the 212.90.186.150 country (Ukraine) side the route is the same for both regions but when you trace from eu-central-1 it also goes through few internal IPs: 100.95.20.135, 100.100.22.2, 100.95.21.129, 100.100.4.58 and one "Frankfurt IPv4 Peering LAN". It could be a problem with this route. Could you help to solve the issue?