iPad (11, iOS version 26.6.1) used with external keyboard with integrated mouse. Fiddled with pointer settings (only changed color, size, nothing outside the Pointer Control settings section) and the day after the pointer became invisible, but still actually usable (for example, moving to the top right corner and dragging down shows the usual control panel).
I tried changing pointer size in the settings: that made it appear again until I touch the screen, at which point it disappears as usual but does not come back when using the trackpad.
I updated to 26.7 and reset all the settings: now it no longer reappears even by changing pointer size.