I'm currently running a beta of Catalina on a macbook. Which by the way if you intend to try, save yourself lots of pain and wait for official release, it's as buggy as can be. Security and permission prompts every other minute ...
To properly(setting i've used in previous installs, found on SE) automount to a NFS drive from my ubuntu server, upon installation i replaced the /net line in /etc/auto_master with :
/net -hosts -nobrowse,nosuid,locallocks,nfc,actimeo=1
What i realize now is that the original auto_master file on Catalina is fundamentally different from previous macOS, seemingly due to the pronounced iCloud integration into the ecosystem.
And you guessed it... i broke the net drive mounting mechanism.
No drive will work properly from finder "Network" tab.
Tried SMB, AFP and NFS
What does work if from finder "connect to server ---> afp://email@example.com" which then prompts the login and mounts correctly.
Subsequently i'm also now experiencing major issues when using icloud, you'd think the macbook is meant to be a frying pan when saving a simple pdf to iclood.
All this to say.. would anyone, pretty please, have the original /etc/auto_master file for Catalina :D
It's not online yet (as far as i could tell)..
Any idea/knowledge/suggestion/experience about usage of iCloud/network drives on Catalina is welcome. Maybe one you smarties already have a custom setup runnning properly.