The second any entity acquires the glowing effect, it says "Saving World" and then proceeds to crash. The exit code is 0, though the crash is not present in 1.17.
Here's the log:
[23:33:26] [Server thread/INFO]: Saving and pausing game...
[23:33:26] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:overworld
[23:33:26] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:the_nether
[23:33:26] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:the_end
[23:33:27] [Server thread/INFO]: Saving and pausing game...
[23:33:27] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:overworld
[23:33:27] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:the_nether
[23:33:27] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:the_end
[23:33:38] [Server thread/INFO]: Stopping server
[23:33:38] [Server thread/INFO]: Saving players
[23:33:38] [Server thread/INFO]: Elgoldo lost connection: Server closed
[23:33:38] [Server thread/INFO]: Elgoldo left the game
[23:33:38] [Server thread/INFO]: Stopping singleplayer server as player logged out
[23:33:38] [Server thread/INFO]: Saving worlds
[23:33:38] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:overworld
[23:33:38] [Server thread/INFO]: ThreadedAnvilChunkStorage (New World (10)): All chunks are saved
[23:33:38] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:the_nether
[23:33:38] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[23:33:38] [Server thread/INFO]: Saving chunks for level 'ServerLevel[New World]'/minecraft:the_end
[23:33:38] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[23:33:38] [Server thread/INFO]: ThreadedAnvilChunkStorage (New World (10)): All chunks are saved
[23:33:38] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[23:33:38] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[23:33:40] [main/FATAL]: Reported exception thrown!
net.minecraft.class_148: Rendering entity in world
at net.minecraft.class_898.method_3954(class_898.java:292) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_761.method_22977(class_761.java:1459) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_761.redirect$zef000$doRenderEntity(class_761.java:3734) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_761.method_22710(class_761.java:1219) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_757.method_3188(class_757.java:727) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_757.method_3192(class_757.java:546) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_310.method_1523(class_310.java:1023) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_310.method_1514(class_310.java:656) [intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.client.main.Main.main(Main.java:215) [intermediary-1.16.3-Aristois.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:226) [subsystem-0.10.6.jar:?]
at net.fabricmc.loader.launch.knot.Knot.launch(Knot.java:173) [subsystem-0.10.6.jar:?]
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:28) [subsystem-0.10.6.jar:?]
at me.deftware.client.framework.main.Main.main(Main.java:43) [EMC-F-v2-latest-1.16.3.jar:?]
Caused by: java.lang.NullPointerException
at net.minecraft.class_4668.method_23520(class_4668.java:654) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_4668$$Lambda$2489/1956291439.run(Unknown Source) ~[?:?]
at net.minecraft.class_4668.method_23516(class_4668.java:32) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_1921$class_4687$$Lambda$3247/1010917841.accept(Unknown Source) ~[?:?]
at com.google.common.collect.ImmutableList.forEach(ImmutableList.java:408) ~[guava-21.0.jar:?]
at net.minecraft.class_1921$class_4687.method_23596(class_1921.java:838) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_1921$class_4687$$Lambda$2515/228349133.run(Unknown Source) ~[?:?]
at net.minecraft.class_4668.method_23516(class_4668.java:32) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_1921.method_23012(class_1921.java:599) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_4597$class_4598.method_22994(class_4597.java:86) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_4597$class_4598.getBuffer(class_4597.java:45) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_4618.getBuffer(class_4618.java:32) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_922.method_4054(class_922.java:132) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_927.method_4072(class_927.java:43) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_945.method_4117(class_945.java:23) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_945.method_3936(class_945.java:11) ~[intermediary-1.16.3-Aristois.jar:?]
at net.minecraft.class_898.method_3954(class_898.java:261) ~[intermediary-1.16.3-Aristois.jar:?]
... 16 more
[23:33:40] [Thread-15/INFO]: Saving EMC-Marketplace_config.json
[23:33:40] [Thread-12/INFO]: Saving Aristois_config.json
[23:33:40] [Thread-11/INFO]: Saving EMC_config.json
happens both in multiplayer and singleplayer if any entity has the glowing effect.
If you could make it so the glowing effect could be disabled, it would be a temporary solution, and as I've said - the crash is not present in 1.17.
Re-installing aristois or removing/re-installing any addons did not help.