Moving slime blocks are supposed to ignore any adjacent immovable blocks. But there is currently an incorrect exception to this. When a slime block is being pulled by a sticky piston, it tries to pull an adjacent comparator and breaks it. Apparently the glitch only affects comparators.
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I made a comment but removed it after some testing - confirming a bug where slime block and sticky pistons can move a comparator but not a repeater.
Confirmed in 0.15.1 on Samsung Galaxy s5