Add missing in.resetMark()

Author: plokhotnyuk

jsoniter-scala-macros/shared/src/main/scala-2/com/github/plokhotnyuk/jsoniter_scala/macros/JsonCodecMaker.scala

@@ -2060,15 +2060,21 @@ object JsonCodecMaker {
                           val l = in.readStringAsCharBuf()
                           ..${genReadSubclassesBlock(leafClasses)}
                         } else in.decodeError(${"expected key: \"" + discrFieldName + '"'})
-                      } else in.readNullOrTokenError(default, '{')"""
+                      } else {
+                        in.resetMark()
+                        in.readNullOrTokenError(default, '{')
+                      }"""
                 } else {
                   q"""in.setMark()
                       if (in.isNextToken('{')) {
                         if (in.skipToKey($discrFieldName)) {
                           val l = in.readStringAsCharBuf()
                           ..${genReadSubclassesBlock(leafClasses)}
                         } else in.requiredFieldError($discrFieldName)
-                      } else in.readNullOrTokenError(default, '{')"""
+                      } else {
+                        in.resetMark()
+                        in.readNullOrTokenError(default, '{')
+                      }"""
                 }
             }
           } else if (isNonAbstractScalaClass(tpe)) withDecoderFor(methodKey, default) {

jsoniter-scala-macros/shared/src/main/scala-3/com/github/plokhotnyuk/jsoniter_scala/macros/JsonCodecMaker.scala

@@ -2079,15 +2079,21 @@ private class JsonCodecMakerInstance(cfg: CodecMakerConfig)(using Quotes) {
                 val l = $in.readStringAsCharBuf()
                 ${genReadSubclassesBlock(objClasses, 'l)}
               } else $in.decodeError(${Expr("expected key: \"" + discrFieldName + '"')})
-            } else $in.readNullOrTokenError($default, '{')
+            } else {
+              $in.resetMark()
+              $in.readNullOrTokenError($default, '{')
+            }
           } else '{
             ${setMark}
             if ($in.isNextToken('{')) {
               if ($in.skipToKey(${Expr(discrFieldName)})) {
                 val l = $in.readStringAsCharBuf()
                 ${genReadSubclassesBlock(objClasses, 'l)}
               } else $in.requiredFieldError(${Expr(discrFieldName)})
-            } else $in.readNullOrTokenError($default, '{')
+            } else {
+              $in.resetMark()
+              $in.readNullOrTokenError($default, '{')
+            }
           }
     }