18gb that is quite large. Might be better if I logged into the site so that I can see how things are setup and perhaps try to replicate this issue locally.
In this case it is not a case of the plugins having compatibility issue. It's a because the codemirror script is being removed from the page.
So this is the cause of the error which is causing Views to fail adding the conditional button to your frontend form. Not much we can do about this given the cause of the issue is coming from a script.
Actually the script is needed to add some of the Toolset buttons to the WYSIWYG editors.
Now if you look at the issue at hand the problem that unhooking this script is causing is making the conditional buttons on the WYSIWYG field to have issues loading, which is the root cause of the error that you're experiencing.