The bindings in your .dyn are unique to particular GUIDs in particular projects… as your next project won’t have the same GUID as the one which is already bound you can’t ‘recreate the issue’ without starting over and recreating the entire process which lead to the issue. I’ve tried a few things with a sample file to do so, but I can’t manage to do so (congrats you’re in uncharted territory somehow). Any ‘new file’ that reproduces it will require you do whatever was done before.
And so to reproduce the issue and help directly we’d need the stripped down .rvt file itself - yes the actual project with the families already in it. Nuke all other model elements (i.e. delete all [walls, floors, levels but one, views but one, materials] and purge 3x, ect.). Then post the .dyn and the .rvt.
That said I don’t think we need the file. Clear out the Element Binding and then see if you can reproduce the issue.