Trident, when thrown, seems to affect how nearby entities look in the same light level. The effect can disappear when player's camera is placed in a different angle, or when player is close to the trident. Similar thing happens even with enchanted trident.
Steps to reproduce:
1. Throw the trident on the ground or directly on the mob (the effect is similar in mid-air, but it lasts much shorter)
2. If necessary, adjust the player's position to see the effect
The glitch is best visible on the screenshot titled "5"
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Noteworthy that it causes the lighting on the oldest nearby entity {Age:<x>}.

@Les3awe Yes, but that was a 1.8 glitch, how does it relate to this newer glitch? All the two share is the fact entities light up.

@unknown That's exactly how they relate 😉

Confirmed in 18w20a

still an issue in 18w20b
This issue relates to MC-79867.