User blog comment:DaNASCAT/Technical Update: April 6, 2016/@comment-1251315-20160406203451/@comment-126761-20160407132524

Ah, yes - the template subpage creation issue has been reported to the team for fixing.

The null edit issue might be related to the complexity of the pages being edited - however, if that behaviour seems to have particularly got worse recently, please do send it in to Special:Contact.