When the monster spawning cage is placed on the magma, you can clearly see the situation under the magma, and the monster spawning cage is gone after you remove it.将刷怪笼放置在岩浆上后，您可以清楚地看到岩浆下的情况，并且将其移除后，刷怪笼下的情况就看不清楚了。
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[Mod] OcelotOnesie
Thank you for your report!
We're actually already tracking this issue at MCPE-42315, so I will resolve and link 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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Intepretation: Placing a spawner directly above lava will render the lava invisible.