Uncaught ReflectionException with TestDox XML report

[sebastianbergmann]

$ git clone https://github.com/sebastianbergmann/raytracer.git
$ cd raytracer
$ ./tools/phpunit --testdox-xml testdox.xml
PHPUnit 8.4.0 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.3.10 with PCOV 1.0.6
Configuration: /usr/local/src/raytracer/phpunit.xml

.............PHP Fatal error:  Uncaught ReflectionException: Method SebastianBergmann\Raytracer\MatrixTest::test_the_inverse_of_a_matrix_can_be_calculated_for with data set "4x4 matrix"() does not exist in phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Util/Annotation/Registry.php:62
Stack trace:
#0 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Util/Annotation/Registry.php(62): ReflectionMethod->__construct('SebastianBergma...', 'test_the_invers...')
#1 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Util/Test.php(254): PHPUnit\Util\Annotation\Registry->forMethod('SebastianBergma...', 'test_the_invers...')
#2 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Util/TestDox/XmlResultPrinter.php(170): PHPUnit\Util\Test::getInlineAnnotations('SebastianBergma...', 'test_the_invers...')
#3 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestResult.php(360): PHPUnit\Util\TestDox\XmlResultPrinter->endTest(Object(SebastianBergmann\Raytracer\MatrixTest), 0.00031900405883789)
#4 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestResult.php(674): PHPUnit\Framework\TestResult->endTest(Object(SebastianBergmann\Raytracer\MatrixTest), 0.00031900405883789)
#5 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestCase.php(597): PHPUnit\Framework\TestResult->run(Object(SebastianBergmann\Raytracer\MatrixTest))
#6 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestSuite.php(432): PHPUnit\Framework\TestCase->run(Object(PHPUnit\Framework\TestResult))
#7 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestSuite.php(432): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))
#8 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestSuite.php(432): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))
#9 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/TextUI/TestRunner.php(425): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))
#10 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/TextUI/Command.php(94): PHPUnit\TextUI\TestRunner->doRun(Object(PHPUnit\Framework\TestSuite), Array, true)
#11 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/TextUI/Command.php(66): PHPUnit\TextUI\Command->run(Array, true)
#12 /usr/local/src/raytracer/tools/phpunit(647): PHPUnit\TextUI\Command::main()
#13 {main}

Next PHPUnit\Util\Exception: Method SebastianBergmann\Raytracer\MatrixTest::test_the_inverse_of_a_matrix_can_be_calculated_for with data set "4x4 matrix"() does not exist in phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Util/Annotation/Registry.php:64
Stack trace:
#0 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Util/Test.php(254): PHPUnit\Util\Annotation\Registry->forMethod('SebastianBergma...', 'test_the_invers...')
#1 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Util/TestDox/XmlResultPrinter.php(170): PHPUnit\Util\Test::getInlineAnnotations('SebastianBergma...', 'test_the_invers...')
#2 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestResult.php(360): PHPUnit\Util\TestDox\XmlResultPrinter->endTest(Object(SebastianBergmann\Raytracer\MatrixTest), 0.00031900405883789)
#3 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestResult.php(674): PHPUnit\Framework\TestResult->endTest(Object(SebastianBergmann\Raytracer\MatrixTest), 0.00031900405883789)
#4 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestCase.php(597): PHPUnit\Framework\TestResult->run(Object(SebastianBergmann\Raytracer\MatrixTest))
#5 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestSuite.php(432): PHPUnit\Framework\TestCase->run(Object(PHPUnit\Framework\TestResult))
#6 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestSuite.php(432): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))
#7 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Framework/TestSuite.php(432): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))
#8 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/TextUI/TestRunner.php(425): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))
#9 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/TextUI/Command.php(94): PHPUnit\TextUI\TestRunner->doRun(Object(PHPUnit\Framework\TestSuite), Array, true)
#10 phar:///usr/local/src/raytracer/tools/phpunit/phpunit/TextUI/Command.php(66): PHPUnit\TextUI\Command->run(Array, true)
#11 /usr/local/src/raytracer/tools/phpunit(647): PHPUnit\TextUI\Command::main()
#12 {main}
  thrown in phar:///usr/local/src/raytracer/tools/phpunit/phpunit/Util/Annotation/Registry.php on line 64