Dolphins

@unknown, we need a source to confirm intentionality. Since this behavior doesn't match the Java Edition, it indicates a parity issue.

On the Java Edition, you break them instead, as you can break them in survival mode, which aligns with the intended behavior as per MC-102908, although in my opinion, they shouldn't be breakable.

relates to MC-269205

Relates to MC-206644

Potentially duplicate of MC-109377

Duplicate of MCPE-52105

This behavior isn't considered a bug. There's no reason why you shouldn't be able to mine blocks while riding a boat. The entity you're riding is consistently untargetable, allowing you to interact with blocks or entities by aiming through it.

No, this doesn't affect ender pearls at all! You might be encountering MC-199813. The decimal values afterward seem to be random and aren't retained.