Can confirm on Nintendo Switch 1.16.1, just got Soul Speed III from fishing
Duplicate of MCPE-59043
That's how pistons work
That's how half slabs work
Baby mobs spawn naturally, this isn't a bug
Mobs picking up armor is normal though...
Are you sure you're using the correct ID? Different wood types use different IDs
Duplicate of MCPE-59043 MCPE-59043
That's how the enchantment system works - the more enchanted, the more expensive it gets - even naming items
Either you or the streamer is on version 1.16.40, and the other on 1.16.100 (but it is likely you that is on 1.16.40). Both of you should update your game to the newest version and see if that helps.