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Bug
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Resolution: Invalid
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None
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Minecraft 1.13.1
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None
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Unconfirmed
Most likely happens as a result of fixing MC-30821.
When two valid portal frames are built that intersect each other, attempting to light an area that would cause both of these to activate only activates one of the two portals, which does not seem to make much sense - either neither portals should light, leaving a fire block, or both should, creating a + shaped nether portal block at the point of intersection much like that of glass panes.