Root causing this myself -- too much coffee and not enough sleep. The behavior I observed was a preemptive context switch while the GPIO was set high.

Seeing odd behavior when rapidly toggling a GPIO on the ESP32-S3-WROOM-1. There appears to be a very repeatable period where the GPIO is high for an extended period of time. The scope is configured to trigger on any pulse longer than 1uS. The code is based on the Hello World example with no changes ...