Build the attached setup, place a redstone block between the pistons and wait a few seconds. Alternatively kill yourself (/kill), fly away and come back etc. (same steps as to reproduce
Actual outcome: Redstone block turns invisible.
Expected outcome: Redstone block stays visible.
Bug also exists for other blocks if you power them
Probably the same underlying issue as
MC-177, but this particular issue can not be reproduced anymore because of changed piston behavior.