In my survival world, when I mine a diamond block with a fortune 3 diamond pickaxe, I only get one diamond.It was the Same when I mined 8 diamond blocks. And sometimes when I die in my world, I spawn under bedrock level. Once, I did lost all my items.
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Please put only one bug report in each ticket. It is very difficult to keep track of bugs when they are not in their own tickets, and it is easier for you to make multiple tickets than for the mods to separate them.
The fortune bug is being tracked at MCPE-67169
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The Fortune bug is known but, I've never heard/seen anyone spawning under the bedrock.
Popular Minecraft YouTuber silentwisperer reports on the Fortune bug in this video: https://www.youtube.com/watch?v=47X9_twQV40&t=131s
The timestamp for the Fortune bug is at 1:01