Audioinjector Zero trouble with touchscreen on Zynthian

[NozonOne]

I've switched out my HifiBerry DAC+ADC Pro for the Audioinjector Zero to save some space on my latest Zynthian build. I've got all of the audio working but I've lost the ability to use the touchscreen on my Waveshare 4" HDMI screen. As soon as I put the audioinjector onto the PI 4B, the touchscreen function stops. I don't have the same issue with the HifiBerry, so I'm wondering if there is something I can try to make this work. All help is appreciated - Thank you!