The enderPearlsVanishOnDeath game rule was added to Java Edition in 1.20.2-pre1, but has not been added to Bedrock since.
MCPE-227822
Game rule enderPearlsVanishOnDeath is not available on Bedrock
Resolved
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Oops, this has been reported already: MCPE-180162
I didn’t find it with a search here, but did on an external site ¯\_(ツ)_/¯