Connecting and disconnecting nets
I have most of my ICs supplied by vcc because I wanted to postpone a decision on what voltage to use. Then I connected to +1.8v. Then I changed my mind and disconnected them.
As a result, there were all sorts of connections between vcc and +1.8v that caused wrong connections.
I don't know if this is way out of scope. I'm used to KiCad where all schematic connections are interpreted only graphically.