Exile upon death abilities not functioning consistently.
The exile upon death abilities of Liesa, Forgotten Archangel/ Leyline of the Void/ Nemata, Primeval Warden aren't functioning consistently sometimes they negate trigger upon death abilities and sometimes they don't. There is a bit of confusion about if they should amongst some judges as well. With this post is an example of how the abilities don't work consistently. This also affects Pitiless Plunder/Chatterfang, Squirrel General/Ravenous Squirrel/Daxos, Blessed by the Sun
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[Deleted User] commented
The problem most likely lies with which player gets affected and how.
Your opponent's Poison-Tip Archer, for example, should not trigger for his creatures dying (becasue they aren't due to your Nemata), but it does trigger for your creatures dying, which are not affected by Nemata.
Liesa affects players differently. An opponent's creatures get exiled instead of dying, its controller's creatures get a dies trigger to return to hand at end of turn.
Likewise, Leyline of the Void only affects opponents, and only actual cards. Tokens can still die properly.