Alternative for Qwiic LED Strip?

Qwiic System
3

The Qwiic LED Strip (and some other Qwiic products) use an ATtiny for the I2C interface. It’s a slow processor, meaning it needs extra time with I2C transactions, resulting in clock stretching. Some devices don’t handle clock stretching well if they’re on the same bus, unfortunately, which I suspect is the case with your IMU. Using an I2C mux as suggested sounds like a good idea, since it will electrically isolate the Qwiic LED Strip from your IMU.