When you lock an object you still can rotate it if it has rotation values. For example, i added sides names with rotation values for a card that used as a map in tiny epic kingdoms, usually you locking them after placing to make it easier to put and grab meeples to/from it, but if you want to lay meeple down (with "2" key) and miss curssor form meeple to card at the base - this card gets unlocked automaticly and flips leaving meeples underneath it.

So basically, i suggest that lock state should also restrict rotation of an object.