- Chinese miners (the network doesn't know that) publish a normal transaction.
- they don't include it for 30 blocks. Western nodes have already switched to a minority uncensored chain after 5 blocks, as they consider the transaction censored.
- Chinese miners include it in 31st block.
A new node joins. It follows the Chinese chain indefinitely.
The core of the problem is lack of objective time (or at least ordering): there's no way to prove to the new node that a transaction was actually censored in the past. From its perspective, the minority chain might have been created after the Chinese block with the transaction was published. As long as there's no external objective time, it's always possible to invent some attack scenario that splits the network for new nodes.
Last but not least, every minority chain is by definition vulnerable to 51% attacks, so even if a solution to censorship could exist in PoW, the minority chain could get intentionally killed this way, constantly generating double spends until people stop using it.
