Clunky, but having just purchased a few of these, you can use virtual devices and the built in Tuya rules engine to create a work around.
Login to Tuya IoT Platform as you did to setup the integration and go to your cloud project
Find the devices tab, where your Tuya devices should be listed
Select add device, virtual device
Select something i.e a switch or bulb
Choose ‘Add to Tuya App Account’
Scan with the Tuya App
Now you have a virtual device and you can build a simple automation to turn the virtual device on and off with motion. My proof of concept is: IF motion detection status ‘alert’ THEN turn on virtual_bulb, wait 20s, turn off virtual bulb.
The bulb shows up in the standard Tuya integration of Home Assistant and you can go ahead and use it like any other motion sensor.
This isn’t perfect as you’re using Tuya automations in the cloud to drive it, but it is a simple way to get wifi motion sensor functionality working as it should.