Steps to reproduce:
1. Build a circuit (look at Attachment)
2. Press the button
MC-93431
FallingSand entity changes data value while two entities at the same place
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
Minecraft 1.8.8, Minecraft 15w46a, Minecraft 15w47a, Minecraft 15w47b, Minecraft 15w47c
Retrieved
Does MC-81746 describe your issue?