When you fall down from a slab with feather falling boots on, you take damage but when you fall from a block which is 0.5 blocks higher, you don't.
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This ticket has not received a response or been updated recently, so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Can you please add the exact height difference (the amount of blocks including the slab you fall / tested the issue with) and the amounts of hearts you loose?
And the level of the feather falling enchant?
An example of the steps to reproduce can also be found in the issue guidelines linked below.
As the chance of feather falling making a difference is determined by random chance as described on this ticket MCPE-29944. The higher the level of the feather falling enchant, the higher the chance is it reduces damage.
This ticket will reopen, when you reply.
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