Merge a sandbox into its parent, then merge again. The second one warns that the parent has changed since the sandbox was created, so it looks like someone else has been working there and your promote will overwrite them. Nobody has. The thing that moved the parent was your own first merge.
The warning exists for a real case, so we can't just drop it. What is missing is that a merge doesn't record where it left the parent, so the next one has nothing to compare against except "the parent is different from when this sandbox was made", which is true and useless.
Merge a sandbox into its parent, then merge again. The second one warns that the parent has changed since the sandbox was created, so it looks like someone else has been working there and your promote will overwrite them. Nobody has. The thing that moved the parent was your own first merge.
The warning exists for a real case, so we can't just drop it. What is missing is that a merge doesn't record where it left the parent, so the next one has nothing to compare against except "the parent is different from when this sandbox was made", which is true and useless.