[ACCount37]

That looks very much like "just a bug" to me.

Long press hard reboot should rectify that if the device isn't severely damaged in a way that causes permanent instability on I2C4. And if it is, then welcome to board level repair, here's your introductory can of pickled suffering.

Now, if you could use that to pwn SEP? Or boot into a custom ROM, checkm8 style? That would be something. But I see zero evidence of this being exploitable in any way.

[FluGameAce007]

If debug logic can be reactivated... even briefly, even locally; then all bets are off for things like firmware extraction, secure boot bypass, or SEP fault analysis.

[ACCount37]

Debug logic reactivated? Show me JTAG then.