i've been experimenting and can't pin it down at all - 1.4.0 works ok on local windows with no other changes, our CI fails every time since we updated to 1.4.0 but only for one particular stack! i've done the updates locally now so not blocking...
i'm about to finish for the weekend and our devops guy is back monday so if i'm still having issues after we do some experimentation i'll do a bug report.