I just noticed that the human presence sensors aren't being exported correctly to Home Assistant and a new SmartThings installation!
In Home Assistant, I realized they're being provided under a different name than "tuya um MS".
Here's a screenshot of one sensor where the name and category are correct, and another where the name and category aren't correct, even though the "present" or "absent" function appears.
These are the device IDs!
eb83af6709fb6f4519eyip
eb9d41a3e76c84d3b4i5to
eb40d6ac0c3888f433eurf
They are all occupancy sensors!
There are also some plugs, switches, and dimmers that aren't displaying their names and are also showing up as supplied by MS.