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It's not just Fiber. It's also V/DSL connections including resold VDSL through a company like Sonic.

I can confirm that on Sonic (resold AT&T) VDSL I am seeing this exact corruption.

Nice find! I had been wondering why I had been seeing odd TLS failure messages recently.

Sonic might be the best avenue to get this fixed. They care about their customers and presumably can talk with AT&T in a much more meaningful way.