Multiple Asserts/Crashes on "A Pirate's Christmas"

Windows_Minecraft - Release_853103
(RC 1.4)

Summary:
Attempting to play "A Pirate's Christmas" when downloaded from the store pops multiple Asserts and crashes the game sometimes. The following two messages appeared:

#1
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Assert Failure - ctrl+C to copy this message to the clipboard!
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Assertion failed: Something went wrong, the chunk wasn't loaded
Condition is false: resource.hasBlock(mMin)
Function: LevelChunk::setupRedstoneCircuit in F:\DarwinWork\7\s\handheld\project\VS2015\Minecraft\Minecraft.Shared\..\..\..\..\src\common\world\level\chunk\LevelChunk.cpp @ 2133
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OK
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#2
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Assert Failure - ctrl+C to copy this message to the clipboard!
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Assertion failed: This block doesn't have that BlockState
Condition is false: false
Function: Block::getBlockState in F:\DarwinWork\7\s\handheld\src\common\world/level/block/Block.h @ 579

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OK
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The following commands are run around the same time the assert pops:

tp @a -17 93 -49
fill 1502 113 4 1502 113 3 redstone_block
setblock 1502 195 2 sponge
spawnpoint @a -17 93 49

Impact:
The map is unplayable

Repro Steps:
1. Download "A Pirate's Christmas" from the store
2. Open it
3. Press the start button

Observed Results:
The game pops an Assert and may crash when it tries to teleport you.

Expected Results:
The game plays.

Screenshots/Videos attached:
No