Night work last night "due to a last minute change" (which explains nothing)

A message last night from Empire State Development:

Attached is a supplement to the Atlantic Yards Project construction activity update. Due to a last minute change, night work is expected tonight, Monday, May 20, within the East Portal Maintenance and Protection of Traffic (MPT) barriers on the Atlantic Avenue roadway.

(Emphasis added)

Thing is, that doesn't explain anything.

Come to think about it, "Due to a last minute change" is an essentially meaningless explanation.
It *was* a last-minute change, but the reason--convenience? a problem?--was not explained.#AtlanticYards #accountability

— Norman Oder (@AYReport) May 21, 2019