Templated image layer remains visible when zooming out using zoom out control

[yhy0217]

<layer- label="Toporama" checked>
  <map-meta name="zoom" content="min=4,max=5"></map-meta>
  <!-- the templated image layer has a minimum zoom level === 4 -->
  <map-extent units="CBMTILE">
    <map-input name="z" type="zoom" value="19" min="4" max="4" ></map-input>
    <map-input name="w" type="width" ></map-input>
    <map-input name="h" type="height" ></map-input>
    <map-input name="xmin" type="location" units="pcrs" position="top-left" axis="easting" min="-6207743.103886206"
      max="3952277.216154434" ></map-input>
    <map-input name="ymin" type="location" units="pcrs" position="bottom-left" axis="northing" min="-3362085.3441706896"
      max="3952277.216154434" ></map-input>
    <map-input name="xmax" type="location" units="pcrs" position="top-right" axis="easting" min="-6207743.103886206"
      max="3952277.216154434" ></map-input>
    <map-input name="ymax" type="location" units="pcrs" position="top-left" axis="northing" min="-3362085.3441706896"
      max="3952277.216154434" ></map-input>
    <map-link rel="image"
              tref="http://wms.ess-ws.nrcan.gc.ca/wms/toporama_en?SERVICE=WMS&amp;REQUEST=GetMap&amp;FORMAT=image/jpeg&amp;TRANSPARENT=FALSE&amp;STYLES=&amp;VERSION=1.3.0&amp;LAYERS=WMS-Toporama&amp;WIDTH={w}&amp;HEIGHT={h}&amp;CRS=EPSG:3978&amp;BBOX={xmin},{ymin},{xmax},{ymax}&amp;m4h=t" ></map-link>
  </map-extent>
</layer->
<layer- label="Static MapML with tiles" checked>
  <map-meta name="zoom" content="min=0,max=10"></map-meta>
  <map-meta name="projection" content="CBMTILE"></map-meta>
  <map-link rel="license"
    href="https://www.nrcan.gc.ca/earth-sciences/geography/topographic-information/free-data-geogratis/licence/17285"
    title="Canada Base Map © Natural Resources Canada"></map-link>
  <map-tile zoom="0" row="3" col="3" src="data/cbmt/0/c3_r3.png"></map-tile>
</layer->

When zooming out using the zoom out control: It is still visible and is not disabled when zoom level = 2. But it will become invisible and disabled if I make any movement on map (ex. zooming in/panning/zooming in using mouse wheel) except zooming out using zoom out control.

When zooming out using mouse wheel: It works as expectation.