Middle row of the keyboard is now:
4, 5, 4, 5, 6.
The 2 keys replaced were inconveniently the left and right parenthesis keys ()
Screenshot showing defect:
Device: HTC M9 / Android 6.0
Issue is not present in the Retail Release.
Edit: Known issue, duplicate of issue noted in https://support.swiftkey.com/hc/en-us/community/posts/115000497349-Number-pad-problem-6-5-4-20-bug-reported-