Bad internet connection only in video games (EndeavourOS)

I encounter internet connection issues only while playing video games (Tekken 8 and VRChat, GTA V online works fine). Outside the game, the internet connection is normal and stable even if it is running but the game itself have trouble connecting to the internet. In Windows 10 they work fine. Behavior: - Tekken 8: slow loading speeds when internet is connected and disconnections when the match is over. Demo works fine. - VRChat:Worlds and avatars downloads are slow, they stop at a certain percentage or they don’t even start (stays at 0%). I have tried: - Disabling the firewall - Changing to Proton Experimental, hotfix and GE Proton - Add gamemoderun %command% and HOST_LC_ALL=**_**.UTF-8 %command% in Launch Options - Updating packages and rebooting the computer - Changing DNS from Google’s to Cloudflare’s Hardware: - TUF GAMING B550-PLUS as motherboard - Ethernet connection - RX6600 as Graphics Card Edit: Proton's log produced by PROTON_LOG=1 Steam.log Edit 2: Issue also reported here Tekken 8 Unable to Connect to Other Players