"undo" does not always restore correct time signature
Seeing this in 3.6.2.
Start with a score whose time signature is specified as "c". Change the signature to cut time, then Undo. The time signature changes to 4/4 rather than back to "c".
This does not happen after changing to any other time signature I've tried, just cut time.
(Falls under #303762: [EPIC] Collection of Undo issues)