Virtual Omni Sensor variable doesn't seem to work as trigger (possible bug?)

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nh.shotftam created this one a while back if you don't want to re-invent the wheel:

Summary 
/*
 * Virtual attribute
 *
 *  Licensed Virtual the Apache License, Version 2.0 (the "License"); you may not use this file except
 *  in compliance with the License. You may obtain a copy of the License at:
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
 *  on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
 *  for the specific language governing permissions and limitations under the License.
 *
 *  Change History:
 *
 *    Date        Who            What
 *    ----        ---            ----
 *    2020-09-17  nh.schottfam	 Original
 * 
 */

metadata {
    definition (name: "Virtual Attribute set", namespace: "nh.schottfam", author: "imnot_bob") {
        capability "Actuator"
		
	attribute "var1", "string"
	attribute "var2", "string"

        command "setVar", ["string", "string"]
        command "clrVar", ["string"]
    }   
}

preferences {
	input("debugEnable", "bool", title: "Enable debug logging?")
}

def setVar(var, val) {
	if(var in ['var1', 'var2']){
    		sendEvent(name: var, value: val)
		if(debugEnable) log.debug "set variable $var"
	} else log.warn "improper arg $var $val,  variable should be var1 or var2"
}

def clrVar(var) {
	setVar(var,' ')
}

def installed() {
	log.trace "installed()"
	for (v in ['var1', 'var2']){
		setVar(v,'')
	}
}

def updated(){
	log.trace "updated()"
	if(debugEnable) runIn(1800,logsOff)
}

void logsOff() {
	log.debug "debug logging disabled..."
	device.updateSetting("debugEnable",[value:"false",type:"bool"])
}