title: R tmap: polygons plotted in tmap_mode("view") but with ("plot") only the first observation
body: <p>I am trying to plot a polygon with <code>tmap</code>  r package.</p>
  <p>My object comes from a shapefile, and looks like:</p>
  <pre><code>geometry type:  POLYGON
  dimension:      XY
  bbox:           xmin: 453850.6 ymin: 7168979 xmax: 513813.6 ymax: 7234603
  CRS:            +proj=utm +zone=36 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs
  First 10 features:
     NeighCode  NameNeigh   Locality AdminPost Populacao Shape_Leng Shape_Area                       geometry
  1       3914    Bassane Chichongue   Calanga       114  41926.454  111037471 POLYGON ((504325.3 7212444,...
  2       3913 Chinguwine Chichongue   Calanga       181  16966.423   14526253 POLYGON ((499974.9 7212379,...
  3       3912   Sihanine Chichongue   Calanga       238  13508.601    9502638 POLYGON ((500542.6 7208832,...
  4       3911    Mpalene Chichongue   Calanga       352   6961.326    2646152 POLYGON ((499063.9 7208412,...
  5       3910 Chichongue Chichongue   Calanga       342  12096.768    6473003 POLYGON ((498551.8 7206144,...
  
  </code></pre>
  <p>When I am trying to plot it with <code>plot()</code>, I get this:</p>
  <p><a href="https://i.stack.imgur.com/H8geS.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/H8geS.jpg" alt="enter image description here" /></a></p>
  <p>But, when I am doing it with <code>tmap</code> with the following code:</p>
  <pre><code>dss_map &lt;- tm_shape(dss_utm) + 
    tm_polygons(&quot;AdminPost&quot;) + 
    tm_layout(frame = F)
  dss_map
  </code></pre>
  <p>I get the following map with <code>tmap_mode(&quot;plot&quot;)</code>.</p>
  <p><a href="https://i.stack.imgur.com/hdvs4.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hdvs4.jpg" alt="enter image description here" /></a>
  Only the first observation is plotted. With <code>tmap_mode(&quot;view&quot;)</code> all of them are plotted.</p>
  <p>Anyone could tell me what is happening? I could plot this object in <code>tmap_mode(&quot;plot&quot;)</code> before without any problems. Here is a link (<a href="https://stackoverflow.com/questions/64380204/tmap-only-plotting-first-polygon-in-sf-geometry-column/66007622?noredirect=1#comment116705656_66007622/">tmap only plotting first polygon in sf geometry column</a>) of a similar question that wasn't answered.</p>
  <p>Thanks for your help!</p>