From the creator's repo:
After flashing in, restart, then enter the system, connect to the computer, enter the ADB interface, enter adb shell and enter settings put global captive_portal_mode 0 After pressing OK, everything can be used normally [If there is a situation that requires manual input, please give me feedback]
they said android 7>= doesn't relevant with settings put global captive_portal_mode 0
(10) GUIDE: How to avoid the Captive Portal Checkin to Google | XDA Developers Forums (xda-developers.com)