My chests won't double when I place them on top of my first double chest.

This works as Intended. You shift clicked them. If you want them together place a wall behind them then place them on the wall.

@Anthony Oh okay! Thanks for telling me

Thank you for your report!
We're tracking this issue as MC-127285, so this ticket is being resolved and linked as a duplicate.

That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.

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