Upon using an enderpearl on an end gateway, the server crashes. This is the part of the log in which the crash occurs. Along with that is how the end gateways work fine when going through them physically whereas enderpearls continue to crash the server.

[21:47:35] [Server thread/ERROR]: Cause of unexpected exception was[21:47:35] [Server thread/ERROR]: Cause of unexpected exception wasjava.lang.ClassCastException: net.minecraft.server.v1_16_R1.EntityEnderPearl cannot be cast to net.minecraft.server.v1_16_R1.EntityPlayer at net.minecraft.server.v1_16_R1.TileEntityEndGateway.a(TileEntityEndGateway.java:160) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.EntityProjectile.tick(EntityProjectile.java:36) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.EntityEnderPearl.tick(EntityEnderPearl.java:93) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.WorldServer.entityJoinedWorld(WorldServer.java:659) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.World.a(World.java:751) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.WorldServer.doTick(WorldServer.java:394) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.MinecraftServer.b(MinecraftServer.java:1104) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.DedicatedServer.b(DedicatedServer.java:354) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.MinecraftServer.a(MinecraftServer.java:1007) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:846) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[spigot-1.16.1.jar:git-Spigot-758abbe-2b00831] at java.lang.Thread.run(Unknown Source) server.txt
[21:47:35] [Server thread/INFO]: Stopping server

Short clip attached of the incident occuring.