I noticed this issue after upgrading from 1.14.7 to 1.15.0.

When the connection window initially opens, it will recognize a connection string in the clipboard as expected. However, if the user launches Compass, the connection window displays, the user then changes focus to a different app to obtain the connection string (URL) and then changes focus back to Compass, the new state of the clipboard is not recognized as having a valid connection URL.

The workaround is to close the connection window, copy the connection string into the clipboard first and then reopen the connection window (with restart or Connect: Connect To).