Hi,
To answer you question, I'm running Aerofly RC 10 ver: 10.00.01.19 set to Steam Auto Update.
Transmitter running EdgeTx Ver: 2.9.3
Using the EdgeTx Joystick interface with straight USB C cable no dongle.
Ran other sims, RC8 etc. with both Steam translation layer and without. Without translation layer RC10 would list input as TX16S but claim device was off. Going into channel setup in RC10 should list first four channels as 1, 2, 3, 4 but would have other and different values with different attempts. Got it working by setting up a new model in the transmitter, did not use a setup widget. If I change anything in the transmitter model, expo, add duel rates etc. it will lose track of the transmitter after a little while. Restart RC10 and I have to create a new model in the transmitter to get things working. Have run about six different other RC/Flight sims with this transmitter and never had a problem. Now that you mention it, I ran jstest-gtk and and all inputs are 100 percent working correctly. Correctly identified input as TX16S. EdgeTx is open source to have so you can pull the source code off Github and see if you need to trap some out-of-bounds values in the RC10 code.