When lingering potions are thrown in either survival or creative, they won't give any mob or player it's potion effects even if they are within it's radius.
Pretty simple to reproduce, just throw any lingering potion at another player or mob and they won't be effected by it even if they are inside it's cloud.
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Someone else made a similar report but it was made invalid because they put the wrong affected version so I made this to get this issue noticed by Mojang.
The images I attached were with the lingering potion of instant damage II.
Mine did not go away ever and it worked with any lingering potion
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-39595.
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Yeah I have the same exact issue and they don't go away too.