One sticky piston can move 3 slime blocks and 5 polished granite blocks, two pistons can not move 6 slime and 10 polished granite blocks! Highly illogical.
But in the third situation (5 slime, 9 granite blocks and pistons aren't engaged with each other using slime blocks) it's all right.
MC-54955
Sticky pistons, slime blocks and strange limit of moving blocks
Resolved
Invalid
0
Intended. This is because that not all of the slime blocks are attached to the same piston.