When you stand on top of a slime block and launch yourself upwards, you get knocked one block to the side of the slime block. This only happens to players and it breaks many player-launching contraptions, such as launching a player up a 1x1 hole.
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[Mod] Celesian
migrated
Thank you for your report!
We're actually already tracking this issue in MCPE-62419, so I've resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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