I've noticed this since Solar 3.0 came out.
When using the snap melee, there's an elongated rectangle that appears when performing the maneuver.
Console: XBSX
See clip (jump to about 20sec)
https://www.xbox.com/play/media/EWMVFWJ5
If that's intentional, then disregard.
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This is because you're using Trespasser. For some weird reason, the reticle gets loooong when using warlock melees.