Fixed #30584 -- Fixed management command when using subparsers with dest parameter.

tests/user_commands/management/commands/subparser_required.py

@@ -0,0 +1,13 @@
+from django.core.management.base import BaseCommand
+
+
+class Command(BaseCommand):
+    def add_arguments(self, parser):
+        subparsers_1 = parser.add_subparsers(dest='subcommand_1')
+        parser_foo_1 = subparsers_1.add_parser('foo_1')
+        subparsers_2 = parser_foo_1.add_subparsers(dest='subcommand_2')
+        parser_foo_2 = subparsers_2.add_parser('foo_2')
+        parser_foo_2.add_argument('--bar', required=True)
+
+    def handle(self, *args, **options):
+        self.stdout.write(','.join(options))