When placing torches on the side of a block, underneath a corner adjacent block, they will sometimes produce a really dark version of their normal particles.
-My smooth lighting is set to maximum.
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i world suggest going to the options menu, then to video settings, then turn "smooth lighting" to high.
My smooth lighting is set to maximum.
Confirmed when you have a block above it.

Confirmed.
The tip of the torch flame goes into the upper block.
This happens with all sorts of particles (see MC-49395)

Yes, same issue.