Tried running this on a paper-1.16.4-353.jar server. Using version Waystones_1.16.3-7.3.1.jar.

Error:
[01:10:07 ERROR]: Could not load 'plugins\Waystones_1.16.3-7.3.1.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:162) ~[patched_1.16.4.jar:git-Paper-353]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:148) ~[patched_1.16.4.jar:git-Paper-353]
at org.bukkit.craftbukkit.v1_16_R3.CraftServer.loadPlugins(CraftServer.java:389) ~[patched_1.16.4.jar:git-Paper-353]
at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:206) ~[patched_1.16.4.jar:git-Paper-353]
at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:936) ~[patched_1.16.4.jar:git-Paper-353]
at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:178) ~[patched_1.16.4.jar:git-Paper-353]
at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.io.FileNotFoundException: Jar does not contain plugin.yml
... 7 more

Fails to load. No other plugins installed.

Waystones is a Forge mod, not a plugin.