There is a bug in the World Type "Caves" Java Edition in the versions tagged that will not allow the bonus chest to spawn near the player. Instead, it will spawn on the top of the bedrock roof.
In a normal world, this may not matter since there are normally plentiful resources around the player. However, in Caves, that is not the case unless you spawn near a visible mineshaft. Those resources are CRUCIAL to your survival in that particular world type. It gives you the wood you need to make a crafting table and make tools. You can at least get to stone tools if you get that chest. Otherwise, you're out of luck unless you find a mineshaft.
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I am so sorry about that. I was not aware.
Thank you for your report!
We're tracking this issue in MC-135169, so this ticket is being resolved and linked as a duplicate.
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