Hi,
Thank you for the detailed report and logs. We will share this case with our R&D team for further investigation.
To help us check the current wireless configuration, could you please send us a configuration backup of the router by private message? Please do not upload the backup publicly, as it may contain sensitive configuration information. Click the Technical Support avatar and then the Message button:
Please also let us know the exact MacBook and iPhone models and their macOS and iOS versions. If your account cannot start a private message, let us know and we can initiate one.