Webcore has their own forum now. Asking questions there will usually get you the quickest answers, because that’s where most of the web core experts are hanging out these days.
https://community.smartthings.com/t/introducing-the-new-webcore-community-forum/96259
That said, there have already been multiple threads on this specific issue in the Core section of this forum, plus a posting in the first bug reports in the community – created wiki, so if you check any of those you should find the answer to your question. 