The polished obsidian does not let you use essential things like the crafting table or enchantment table when it is in your hand, moreover, a furnace can not be used either
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is duplicated by 1
Comments 2
Thank you for your report!
We're actually already tracking this issue at MCPE-65522, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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There is no such thing as polished obsidian