Board Thread:Support Requests - Designing Your Wiki/@comment-29943340-20180415215318/@comment-9605025-20180415225429

I don't think PreloadTemplates has anything to do with your VisualEditor issue. According to the description of the script, it is meant to work with the classic source editor. That being said, the issues with VisualEditor might be addressable using JS. However, since I don't know the details about how the VisuaEditor works, I have no idea how complicated it might be. For now, I would suggest just submitting this as feedback to Wikia. You can do that using Special:Contact/feedback.