[MCPE-170520] Custom blocks are broken

When loading a world with custom blocks, the game fails to register the blocks. The following gets produced in the content log

19:15:43[Json][error]-block_definitions | C:/Users/USERNAME/AppData/Local/Packages/Microsoft.MinecraftWindowsBeta_8wekyb3d8bbwe/LocalState/games/com.mojang/development_behavior_packs/smokey_bedrock_bp | blocks/ancient_vase.json | upgrade blocks/ancient_vase.json | Final json version '1.19.80' failed to upgrade from document version '1.19.70'
19:15:43[Json][error]block_definitions | C:/Users/USERNAME/AppData/Local/Packages/Microsoft.MinecraftWindowsBeta_8wekyb3d8bbwe/LocalState/games/com.mojang/development_behavior_packs/smokey_bedrock_bp | blocks/ancient_vase.json | upgrade blocks/ancient_vase.json |  > minecraft:block -> components:  undefined schema

How to reproduce:

Download the mojira.mcpack attached
Import into Minecraft Preview 1.20.0.24
Enable Holiday Creator Features

Expected Behaviour:

The block can be given via commands

Actual Behaviour:

The block doesn't exist and a content log is produced instead