Length limit to GeoServer SLD files in QGIS?

I’m symbolizing a polygon layer by an attribute called kkod. I’ve copy pasted the FeatureTypeStyle block about 10 times for each kkod but the 11th time the WMS layer is no longer symbolized in QGIS, but it is valid and visible in layer preview in GeoServer.

<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
  xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd"
  xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc"
  xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <NamedLayer>
    <Name>tk_my</Name>
    <UserStyle>
      <Title>A dark orange polygon style</Title>
     <FeatureTypeStyle>
       <Rule>
         <Name>Vattenyta</Name>
         <ogc:Filter>
           <ogc:PropertyIsEqualTo>
             <ogc:PropertyName>kkod</ogc:PropertyName>
             <ogc:Literal>1</ogc:Literal>
           </ogc:PropertyIsEqualTo>
         </ogc:Filter>
       <PolygonSymbolizer>
         <Fill>
           <CssParameter name="fill">#bed4eb</CssParameter>
         </Fill>
         <Stroke>
           <CssParameter name="stroke">#bed4eb</CssParameter>
           <CssParameter name="stroke-width">1</CssParameter>
         </Stroke>
       </PolygonSymbolizer>
        </Rule>
      </FeatureTypeStyle>

many more

     <FeatureTypeStyle>
       <Rule>
         <Name>Låg bebyggelse</Name>
         <ogc:Filter>
           <ogc:PropertyIsEqualTo>
             <ogc:PropertyName>kkod</ogc:PropertyName>
             <ogc:Literal>14</ogc:Literal>
           </ogc:PropertyIsEqualTo>
         </ogc:Filter>
       <PolygonSymbolizer>
         <Fill>
           <CssParameter name="fill">#fadaa2</CssParameter>
         </Fill>
         <Stroke>
           <CssParameter name="stroke">#fadaa2</CssParameter>
           <CssParameter name="stroke-width">0.5</CssParameter>
         </Stroke>
       </PolygonSymbolizer>
        </Rule>
      </FeatureTypeStyle>
      
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>

I’ve looked in the very long log, can it be this that is causing the problem?

Request: getServiceInfo
2021-07-15 11:37:15,641 ERROR [geoserver.ows] - 
org.geoserver.platform.ServiceException: Rendering request would use 71895KB, whilst the maximum memory allowed is 65536KB