[donretag]

"I documented my findings, and sent an email to my ISP. I quickly got a response back acknowledging that this is a bug on their side, and thanking me for my research."

I am actually shocked that: a) the ISP has an email or any sort of asynchronous communication. Most in the US have at best a "talk to a bot" functionality b) they acknowledge the behavior and did not simply respond "have you tried rebooting the router?"