When converting a world made on the legacy edition of Minecraft PS4 edition, some items contained in chests don't transfer over. It appears that only items that I took from the creative inventory failed to transfer, as the locater map that came with me when I made the world is still there on Bedrock (see screenshots)

Steps to reproduce:

1. Create a world on the old version of Minecraft PS4 edition
2. Place a chest and put some items in it, optionally including the map that you spawn with
3. Convert the world to bedrock edition on the new version
4. Look in the chest on the converted world and notice the missing items