The world download for Stampy's Lovely World released on Bedrock Marketplace is not on the latest version, despite Minecraft Bedrock being fully updated to the latest stable version, 1.21.30. This happens regardless of how many worlds are created. However, if a new world with no Marketplace world templates is made, it is fully up-to-date. I have shown this example in the screenshots below with the mace in the creative inventory. It appears in the brand new world but not in Stampy's Lovely World Marketplace download.

Additionally, items like the Sniffer egg, brush, wolf armour, armadillo spawn egg/scute etc do appear in Lovely World creative inventory, meaning the download must be locked to a specific previous version.

Steps to Reproduce:

For Stampy's Lovely World:
1. Purchase Stampy's Lovely World on the Minecraft Marketplace

2. Open Minecraft Bedrock (updated and logged in)

3. Create a new world with the Stampy's Lovely World Marketplace template in creative mode

4. Search the creative inventory for the mace (or any item from a recent update)

For a brand new world:

1. Create a new world (no templates) in creative mode

2. Search the creative inventory for the mace (or any item from a recent update)