I can only tell you that, personally, I hate suppression and all that comes with it 😅 Generally speaking, the "Insert" feature works better in nested dimensions, basically because it's easier to get at least one row always visible.
I've only tested 7.4.2 and to be honest I don't like what I see. Can you please get in touch with Support and work with them, there might well be gremlins in the machine.
Thank you Jack for your comment. In fact in this case, IC is the nested dimension and Account is the main one. Still the issue persist given that we're in developing stage so we don't have data everywhere.
Thank you
