APFS does not support exchangedata(2) meaning that atomic save has to be done using a rename.
This means that the inode is not preserved and the date of the file’s directory is updated.
There are some disadvantages to this, and I have been running with atomic saving disabled shortly after switching to APFS, so I believe it is best to make this the default behavior.
Previously we would automatically pick up an Info.plist file copied using any of the CP_* keys, and both move it to the correct location (when belonging to target built) or ignore it, if we were copying it from an imported target.
To simplify the logic in the build system, it is however better to be explicit about this, also because we could actually want an Info.plist file among our copied files.
