Hi , yes , me too, i'm not sure why but I guess 3.9.16 is a beta and for some reason auto update reverts to 3.9.15.
I just turned off auto update for now.
Maybe someone can explain why this happens.
I also have the issue where left clicking on volume/network, battery, and recall icons in system tray randomly stops working.
It happens with 3.9.15 and 3.9.16.
I'm on win insider beta 24H2.
I didn't think about it being due to SAB as I also have Windhawk with taskbar and system tray mods and I have "Use enhanced classic taskbar" turned off in SAB anyway.
Will disable SAB and wait to see if it still occurs.