My device = Kingzone K1 turbo
I exspected that the comparator' back is shining AND the comparator makes a redstone signal.
I saw the comparator was not activated, even it did not make a redstone-signal, normally the comparator should do this!
How to reproduce:
1. Place a comparator
2. Place a detector rail as a redstone-power-source at his back
3. Place any type of minecart on it
4. You will see, the comparator is not making anything
UPDATE: As of 0.16.1, this bug is only partially fixed: Comparators can receive power from redstone dust that is powered by a detector rail, but they cannot recieve power directly from the detector rail. Sometimes, however, placing a comparator next to a detector rail will cause it to be momentarily powered when it is first placed, giving off a pulse of at least 1.5 rticks (3 gameticks), or however long a pulse is required to be in order to invert a redstone torch in MCPE. See this video for a demonstration: youtu.be/9E4gOTQ4W7c
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I don't know about 0.15.0 beta but in 0.14.3 this only happens when the power source of a comparator is a detector rail with any kind of minecarts on top of it.
I updated the description for detector rails only, as I tested it with other power sources myself and the comparator worked as it should work. So the problem is only with detector rails.
I updated the description to correct some grammar and spelling errors to prevent misunderstandings. Also I have added some labels.
As of 0.16.1, this bug is only partially fixed: Comparators can receive power from redstone dust that is powered by a detector rail, but they cannot recieve power directly from the detector rail. Sometimes, however, placing a comparator next to a detector rail will cause it to be momentarily powered when it is first placed, giving off a pulse of at least 1.5 rticks (3 gameticks), or however long a pulse is required to be in order to invert a redstone torch in MCPE. See the newly attached screenshot. I will make a video on this shortly.
Nevermind, I'm stupid. This is WAI. 😛 (Except the pulse that sometimes happens... but that should be a separate report.)
Isn't this fixed now ?
When a comparator is next to detector rail it will measure the contents in the mine cart. Fill a minecart with chest witn some items and it works. So the "half not fixed" part is WAI.
This image from the the wiki shows the correct results
@unknown You're right. My mistake. I'll close this issue as fixed now. However, the occasional short pulse the comparator gives off when initially placed sometimes is still a bug, and I've reported that in a new ticket as MCPE-18008.
Confirmed for 0.14.3