When launching from a slime block, it pushes the player to the side. This by its self is bad, but if there are blocks nearby and you don't bounce in the right position, you hit the wall and don't get launched.
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[Mod] OcelotOnesie
Thank you for your report!
We're actually already tracking this issue at MCPE-62419, so I 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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Sniper1.1