So I went to the sources tab to do what you said and had it watch through, and I get the what I assume is on of the variables being "self". And hovering over or around it shows me different other functions of sorts, I'm not entirely sure what I should be looking for or if this "self" is the answer (Or if I'm doing this right). By malformed custom language do you mean a different set of dialects? (Like the Rivals of Aether dialect/api since I did get that at one point and added it in the api files, which isn't there now considering the redownloads) Or do you mean mistypings/grammatical errors or maybe that athis self thing is the one affecting the functions in some strange way.
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I should also mention that when I clicked the error links to take me to where it seems to be having trouble and it tells me it's within the app.js file, which has the mention of self on one or two of them. so maybe that is where it's being stopped at? If you'd like I can give you screenshots of highlighted pieces of code on where it says the errors may be.