1.19.50 not showing camels,rafts,signs,etc

1.20 Items not showing up

all the 1.20 items aren't showing up (for me) in the 1.19.50.21 preview. i searched for the following: 

• camels
• elevated signs/signs
• rafts/bamboo raft{}
• bamboo (shows up as the jungle bamboo sticks)
• chiseled bookshelf/bookshelves

MC Bedrock Preview is not updating to 1.19.50.21, it is stuck on .20.