https://www.didgeridoohan.com/magisk/MagiskHide#hn_SafetyNet_API_errorOn Mi 9 pro Android 11 lastest developer Rom, installed magisk fix master and I got this result. The fact is that after updating magisk from 20.x to 21.x I get error while trying to get API google file, it cannot connect to the server. I cannot even see any module on line, I have to find them on the net, download through browser and after install with magisk. Beside that it passed Safetynet from third app. Magiskhide is installed and enabled.
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The fact that you do not see any modules suggest that there is something that is blocking some parts of the Manager getting access to the internet. In the past that has usually been because of a custom hosts file.