Powering 2 pistons extends the wrong piston!

I powered 2 pistons facing upwards on top of each other with a torch, I expected the bottom piston to extend first and after that the top one like it did in all previous versions.

Instead it extends the top piston. (There is also a visual glitch, it looks like the bottom piston extends but in fact the top one does)

How to reproduce:
1. Build the setup from my picture.
2. Activate the lever.
3. Notice that the top piston extends instead of the bottom piston.