Filter added to CommandLineState has no effect

Hi, I have a run configuration class that extends RunConfigurationBase (com.intellij.execution.configurations). In the overriden getState method of the class, before returning a CommandLineState, I try to add a filter to it to have some text that matches a regex underlined. The command executes and the process runs and terminates without problems, but the filter has no effect on the output displayed in the console. Here's the source code:

import org.jetbrains.annotations.*;

import com.intellij.execution.ExecutionException;
import com.intellij.execution.Executor;
import com.intellij.execution.configurations.*;
import com.intellij.execution.filters.Filter;
import com.intellij.execution.process.*;
import com.intellij.execution.runners.ExecutionEnvironment;
import com.intellij.openapi.editor.markup.*;
import com.intellij.openapi.options.SettingsEditor;
import com.intellij.openapi.project.Project;

import java.awt.*;
import java.util.regex.*;

public class MyRunConfiguration extends RunConfigurationBase {
   
   protected MyRunConfiguration(Project project, MyConfigurationFactory factory, String name) {
      super(project, factory, name);
   }
   
   @NotNull
   @Override
   public SettingsEditor<? extends RunConfiguration> getConfigurationEditor() {
      return new MySettingsEditor();
   }
   
   @Override
   public void checkConfiguration() throws RuntimeConfigurationException {}
   
   @Nullable
   @Override
   public RunProfileState getState(
      @NotNull Executor executor,
      @NotNull ExecutionEnvironment executionEnvironment
   ) throws ExecutionException
   {
      
      CommandLineState state = new CommandLineState(executionEnvironment) {
         
         @NotNull
         @Override
         protected ProcessHandler startProcess() throws ExecutionException {
            
            GeneralCommandLine commandLine = new GeneralCommandLine("/path/to/some/executable");
            commandLine.createProcess();
            
            OSProcessHandler processHandler = new OSProcessHandler(commandLine);
            processHandler.startNotify();
            
            return processHandler;
            
         }
         
      };
      
      // The added filter has no effect on the output of the console,
      // its applyFilter method is never even called!
      state.addConsoleFilters(new Filter() {
         
         @Nullable
         @Override
         public Result applyFilter(String line, int entireLength) {
            
            Matcher matcher = Pattern.compile("[\\w_\\-.]*:[0-9]+:[0-9]+").matcher(line);
            
            if (matcher.matches()) {
               
               MatchResult matchResult = matcher.toMatchResult();
               
               return new Result(matchResult.start(), matchResult.end(), null,
                  new TextAttributes(null, null, null, EffectType.LINE_UNDERSCORE, Font.PLAIN));
               
            }
            
            return null;
            
         }
         
      });
      
      return state;
      
   }
   
}

Before anyone says that it's probably simply the regex that is not matching anything in the output, that can't be the reason as the applyFilter method of the added filter is not even being called! Any help would be much appreciated :)