Sadly, its not working in latest Paper Spigot version.

Error:

[14:43:54 INFO]: [dynmap] Loading dynmap v3.0-beta-9-250
[14:43:54 INFO]: [dynmap] version=git-Paper-228 (MC: 1.15.2)
[14:43:54 ERROR]: [dynmap] Unable to find method getById for net.minecraft.server.v1_15_R1.Block
[14:43:54 ERROR]: [dynmap] Unable to find method a for net.minecraft.server.v1_15_R1.BiomeBase
[14:43:54 INFO]: [dynmap] Unload queue not found - default to unload all chunks
[14:43:54 INFO]: [dynmap] inhabitedTicks field not found - inhabited shader not functional
[14:43:54 ERROR]: [org.bukkit.craftbukkit.v1_15_R1.CraftServer] Error initializing dynmap - bukkit version incompatible! initializing dynmap v3.0-beta-9-250 (Is it up to date?)
java.lang.IllegalArgumentException: Error initializing dynmap - bukkit version incompatible!
at org.dynmap.bukkit.helper.BukkitVersionHelperGeneric.(BukkitVersionHelperGeneric.java:166) ~[?:?]
at org.dynmap.bukkit.helper.BukkitVersionHelperCB.(BukkitVersionHelperCB.java:45) ~[?:?]
at org.dynmap.bukkit.Helper.getHelper(Helper.java:59) ~[?:?]
at org.dynmap.bukkit.DynmapPlugin.onLoad(DynmapPlugin.java:810) ~[?:?]
at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadPlugins(CraftServer.java:364) ~[patched_1.15.2.jar:git-Paper-228]
at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:234) ~[patched_1.15.2.jar:git-Paper-228]
at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:895) ~[patched_1.15.2.jar:git-Paper-228]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_242]