IllegalStateException being thrown by QueryService.getInstance()

[patrickdundas]

Plan v5.5 build 2391 running on Paper MC 1.20 Build 6

I am following the Query API Getting Started guide and am having the following error. The below code in PlanHook.java throws the warning that Plan is not enabled (IllegalStateException):

private QueryAPIAccessor createQueryAPIAccessor() {
        try {
            return new QueryAPIAccessor(QueryService.getInstance());
        } catch (IllegalStateException planIsNotEnabled) {
            Bukkit.getLogger().warning("Warning: Plan is not enabled");
            // Plan is not enabled, handle exception
            return null;
        }
    }

In plugin.yml, I've tried making Plan both a soft and regular dependency:
depend: [Plan]

In pom.xml, I have confirmed that the plan API for 5.5.2391 is loaded correctly, and I have the same Jar running on my server. I've confirmed that Plan enables before my plugin in the startup logs:

[03:13:25 INFO]: [Plan] Enabling Plan v5.5 build 2391
[03:13:26 INFO]: [Plan] 
[03:13:26 INFO]: [Plan]            ██▌
[03:13:26 INFO]: [Plan]      ██▌   ██▌
[03:13:26 INFO]: [Plan]   ██▌██▌██▌██▌  Player Analytics
[03:13:26 INFO]: [Plan]   ██▌██▌██▌██▌  v5.5 build 2391
[03:13:26 INFO]: [Plan] 
[03:13:26 INFO]: [dynmap] Loading default resource pack
[03:13:26 INFO]: [Plan] Locale: 'English' by AuroraLS3
[03:13:26 INFO]: [Plan] Downloading SQLite Driver, this may take a while...
[03:13:26 INFO]: [Plan] Database: Making sure schema is up to date..
[03:13:26 INFO]: [Plan] SQLite-database connection established.
[03:13:26 INFO]: [Plan] All database patches applied successfully.
[03:13:26 INFO]: [Plan] WebServer: Certificate KeyStore File not Found: plugins/Plan/Cert.jks
[03:13:26 INFO]: [Plan] WebServer: No Certificate -> Using HTTP-server for Visualization.
[03:13:26 INFO]: [Plan] WebServer: User Authorization Disabled! (Not secure over HTTP)
[03:13:26 INFO]: [Plan] Webserver running on PORT 8804 ( http://mc.patrickdundas.io:8804 )
[03:13:26 INFO]: [Plan] Loading server identifying information
[03:13:26 INFO]: [Plan] Server identifier loaded: bbb731c5-81d4-454f-859f-f5f00e28a059
[03:13:27 INFO]: [Plan] Registered extension: LuckPerms
[03:13:27 INFO]: [Plan] Player Analytics Enabled.
[03:13:27 INFO]: [MYPLUGIN] Enabling GUIShops v0.0.1
[03:13:27 INFO]: [MYPLUGIN] hookIntoPlan - returning createQueryAPIAccessor
[03:13:27 WARN]: [MYPLUGIN] Warning: Plan is not enabled
[03:13:27 INFO]: Hooked into Plan
[03:13:27 INFO]: [spark] Enabling spark v1.10.34
[03:13:27 INFO]: [spark] Using Paper ServerTickStartEvent for tick monitoring
[03:13:27 INFO]: [spark] Starting background profiler...
[03:13:28 INFO]: [TabTPS] Enabling TabTPS v1.3.17
[03:13:28 INFO]: [TabTPS] Successfully registered Mojang Brigadier support for commands.
[03:13:28 INFO]: [TabTPS] Successfully registered asynchronous command completion listener.
[03:13:28 INFO]: [GSit] Enabling GSit v1.4.5
[03:13:28 INFO]: [GSit] The plugin was successfully enabled.
[03:13:28 INFO]: Running delayed init tasks
[03:13:28 INFO]: [Plan] Storing sessions that were preserved before previous shutdown.
[03:13:29 INFO]: Done (12.739s)! For help, type "help"
[03:13:29 INFO]: Timings Reset
[03:13:29 INFO]: [Plan] You're using the latest version.