Quad Rotary Encoder not discovered with Arduino GIGA I2C scan

[mikeysklar]

The Adafruit I2C Quad Rotary Encoder Breakout with NeoPixel is not being found with an i2c scan using the Arduino GIGA. (Arduino code base)

The GIGA works great with a NeoKey 1x4 (SAMD09 based).

Moving the Quad Rotary Encoder to an ESP32 also works fine.

There is an I2C communication fail happening between the:

GIGA STM32 <--> Quad Rotary Encoder ATtiny817 Forum thread has additional testing details. Scope traces courtesy of @fddrsn.