I have tested in both pvp and pve maps, and just like the title says, the truesight doesn't always work the way it used to. For example, on the pvp map "cauldron" the ability doesn't work, yet it seems to work on the map "Endless Vale"
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Been having the same issue I'll use Wish-Ender and like once every like 20 arrows the truesight will finally kick in.