Dropdowns problem in Bootstrap 4.2.1

Has anyone else found their drop downs have stopped working since Bootstrap 4.2.1? The console shows the following error

Uncaught DOMException: Failed to execute 'querySelector' on 'Document': 'javascript:void(0)' is not a valid selector.

The issue seems to be documented here but I can’t get any of the fixes working

I know this isn’t a Wappler issue, just a side effect. Really liking the new form stuff in this update