Editor blocked in firewall causes performance spikes due to socket failures

Why do I get this when I don’t want Unreal to access the internet (in a single player project):

It’s every other second as well, regular until I shut down the engine down. I don’t even have to press play!

EDIT: The TCP and UDP plugins were activated. I did not do this. Is this new in 4.25? The project is old and this just started happening.