Filter Reload error for WireGuard Rule

[lnguyen]

I could use some help with debugging an error I am encountering with wireguard v0.1.5_3 on pfSense CE 2.5.2. I am observing this issue on only 1 of 5 pfSense firewalls (pfSense+ 21.05.2 and pfSense CE 2.5.2). I just don't see the error in the config. Any helping eyes on this issue is greatly welcomed.

Filter Reload
There were error(s) loading the rules: /tmp/rules.debug:272: syntax error - The line in question reads [272]: pass in quick on $WireGuard inet from any to any tracker 1637108511 keep state label "USER_RULE"
@ 2021-11-16 16:21:56

		<rule>
			<id></id>
			<tracker>1637108511</tracker>
			<type>pass</type>
			<interface>WireGuard</interface>
			<ipprotocol>inet</ipprotocol>
			<tag></tag>
			<tagged></tagged>
			<max></max>
			<max-src-nodes></max-src-nodes>
			<max-src-conn></max-src-conn>
			<max-src-states></max-src-states>
			<statetimeout></statetimeout>
			<statetype><![CDATA[keep state]]></statetype>
			<os></os>
			<source>
				<any></any>
			</source>
			<destination>
				<any></any>
			</destination>
			<descr></descr>