Migration from D7 to D9

There is still error with this module during the Migration.

Error: Cannot use string offset as an array in Drupal\mailsystem\Plugin\migrate\process\MailSystemModules->transform() (line 36 of /web/modules/contrib/mailsystem/src/Plugin/migrate/process/MailSystemModules.php).

The code line at Line # 36 of MailSystemModules.php file -
$value[$module][$index]['formatter'] = $data;

Since this issue is closed(fixed) and only maintainers can reopen, so would like this to be attended by the maintainers please and @srishtiiee at Acquia to please fix this broken functionality.

Thanks

I have applied the patch and this issue is not yet resolved.

Created a follow-up issue for the reports after the initial commit 🐛 Error: Cannot use string offset as an array in MailSystemModules.php on line 36 Needs review