Not sure how to explain so I'll list how it happens.
How to replicate bug:
-Place 2 sticky pistons facing sideways on top of one another
-Place a slime block on the top piston, and any other block on the bottom
-Power the top piston from behind USING A REPEATER* (as shown in image)
-Unpower the top piston and the other block retracts, but the slime block does not
*Also happens with comparator, redstone going into a block behind top piston, or a redstone block placed behind top piston
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duplicates 1
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Thank you for your report!
We're already tracking this issue at MC-59474, so I will resolve and link this ticket as a duplicate.
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Can confirm for 19w40a