Cobwebs are affected by block lighting in full sky lighting
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The bug
Cobwebs, when not lit by block light, appear darker than the light level they actually have. Note that this does not affect similar blocks such as flowers and saplings. (May have to do with the fact that cobwebs project shadows).
Note that brightness must be set to moody for this to be reproducible (on full brightness, they all look the same; on moody, the brightness varies from dark to the brightness seen on full).
Spider webs have done this since at least 1.6, probably earlier (couldn't be bothered to test further back). They behave exactly the same in 1.7.4 as in 14w07a.
I'm pretty sure this is a feature, not a bug. Spider webs have the same effect as plant leaves on lighting.
Ah, I actually can reproduce now, if I rebuild my setup. I think MC-125900 or something broke the skylight levels in the world and that was affecting it (though, that doesn't entirely make sense).
This issue also seems to affect shulker boxes in the 1.15 snapshots. This is mostly noticeable on withe shulker boxes with the brightness set to moody.
Confirmed