diff --git a/src/wp-includes/html-api/class-wp-html-tag-processor.php b/src/wp-includes/html-api/class-wp-html-tag-processor.php
index fe8a20c1ea4ee..e41e1120550b5 100644
--- a/src/wp-includes/html-api/class-wp-html-tag-processor.php
+++ b/src/wp-includes/html-api/class-wp-html-tag-processor.php
@@ -1619,7 +1619,6 @@ private function skip_script_data(): bool {
 				( 'p' === $html[ $at + 4 ] || 'P' === $html[ $at + 4 ] ) &&
 				( 't' === $html[ $at + 5 ] || 'T' === $html[ $at + 5 ] )
 			) ) {
-				++$at;
 				continue;
 			}
 
diff --git a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
index a066543d8e11f..fd73ddc43a4ba 100644
--- a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
+++ b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
@@ -2116,6 +2116,8 @@ public static function data_script_tag(): Generator {
 			yield 'Script tag with </script\f> close'             => array( "<script></script\f>", true );
 			yield 'Script tag with </script\r> close'             => array( "<script></script\r>", true );
 			yield 'Script with type attribute'                    => array( '<script type="text/javascript"></script>', true );
+			yield 'Script text less-than'                         => array( '<script><</script>', true );
+			yield 'Script text less-than solidus'                 => array( '<script></</script>', true );
 			yield 'Script data escaped'                           => array( '<script><!--</script>', true );
 			yield 'Script data double-escaped exit (comment)'     => array( '<script><!--<script>--></script>', true );
 			yield 'Script data double-escaped exit (closed ">")'  => array( '<script><!--<script></script></script>', true );