I literally have no idea what you are talking about. You can send garbage packets that conform to no known protocol on the internet. You can get more bit errors or perfect bit errors that make your bit error detection pass while still forwarding corrupt payloads. Transport protocols and channels must be and are robust to this.

“Damaged” frames and frame integrity only matter if you need the contents of the entire packet to remain intact. Which you explicitly do not when truncating.

The only new problem that arises is that maybe the in-band length information or headers get corrupted resulting in misinterpreting the truncation that actually occurred. And again, you already need to be robust to garbage. And you can just change my proposal to recompute the integrity tag on the truncated data if you think that really matters.

I agree you have no idea what I’m talking about