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[Derakon]

I did a quick search of the bugreport forum threads and didn't see anything

Currently raised drawbridges are fluid-tight, so water and magma can't enter the squares of the bridge while it is raised. Basically it acts like a wall. However, if the bridge was installed with non-magmasafe mechanisms and the fluid in question is magma, then when the magma enters the squares that the bridge would occupy when lowered, the mechanisms melt and the bridge deconstructs.

From a coding standpoint, this makes sense, as the bridge "building" is still in those tiles and thus can get heated by the magma. However, intuitively it doesn't make sense, as the bridge isn't physically in those tiles when raised.

[Sphalerite]

The bridge doesn't occupy those squares when raised, but apparently the mechanisms do.

[Derakon]

That'd be a bit like putting the hinges of your gate on the outside; pretty useless as far as making a secure gate is concerned.

[Noble Digger]

Fortunately this is predictable behavior so it's possible to plan around it for the meanwhile. I lost a cute little ocean fort to this quirk a long time ago, as the bridge was the only thing holding back the contents of the 3rd-level-deep of the magma pipe after I channeled out the exterior walls from above...