Thanks 'Eskimo' for raising a bug for this defect. Please keep us posted on updates.

Tested with iOS 14.2 Beta 1. Still not fixed.

We have tested against iOS 14 b3 and the issue is resolved. Now we can use '55555' for network connections. Thanks eskimo - https://developer.apple.com/forums/profile/eskimo for your valuable inputs. Now looking forward to the public release.

Issue is resolved in iOS 14 b3. Looking forward to the public release with this fix.