Landing on a block being extended by a piston emits Update Game block particles

When I built one of those infinite trampoline contraptions, I noticed that most of the time when I landed, it emitted the particles of landing on an Update Game block.

Steps to reproduce:
1. Make a 3x3 infinite trampoline or something like that using a sticky piston and a block.
2. Land on it while it's being pushed.

I am using a Samsung Galaxy S6.