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Thanks for reaching out.
That's weird. I don't know why this is happening, and I don't have the devices to test it. Nevertheless, I will try my best to help you.
Normally, when an I2C device is not recognized is because it is not powered, so we recommend the users to supply the I2C sensors with an external power supply, please try it and let us know if it works.
I know that you must use 5 V for the GPIOs, as a workaround if both devices are recognized using IOREF = 3.3 V, use this configuration and try to use the level shifters for the GPIOs that need 5 V.
I hope you find this useful.
Have a nice day.