Hi,
I found a very annoying bug in the current 15.31 firmware.
Context: I usually set the backlight to NOT turn on for touches or button presses. If I need backlight, I can still use the dedicated LIGHT button to turn it on for a few seconds.
I decided to set the "Touch Lock" option to ON in the display settings. What I found is that when I arrive at the watchface and wait for a few seconds, then the touch lock activates as expected, however, I cannot unlock it. The blue unlock icon in the upper part of the screen simply does not show up for touches. Also, if I swipe up / down, then I can access the notification center / widgets even though the watch is still in locked state. The only way I can access the unlock icon on the watchface is by activating the backlight. If the backlight is turned on, then the blue unlock icon shows up for touches as expected.
I also attached a video showing the issue.
Please fix this bug in the upcoming firmware release. Thank you! :)