Once I was trolling my friend and I punched him off a a tall tower I built and he fell in some lava and he took fall damage.
To reproduce: Have a platform and put lava on it. Make sure every lava has a block under it so you will take the fall damage. Then make a tall tower, go in survival, and jump onto the lava with the block under it. You will take fall damage.
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Thank you for your report!
We're actually already tracking this issue at MCPE-30930, so I will resolve and link this ticket as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Orange 870 Penguin, did you try this with lava source blocks? If you do, please update the attachments.