Migrate message is confusing when trying to reimport already imported entity with --idlist flag

The error message in the Issue Summary is not in core. I searched and found that it is from Migrate Tools. Since this is about updating the text of that message, I am moving this to Migrate Tools.

Had to find this issue by searching for "The following specified IDs were not found in the source IDs:" to confirm that the Drupal migration was lying to me. Thanks! It's probably not just the message but the understanding of what is happening that needs to change, that is we don't just change the message text because sometimes it is output correctly as when the view ID truly isn't there.

In my case, I am encountering this message while attempting to import an item and the import is not working when I specify an id. It only works if I don't specify the id (and yes, my source id is correct). But I do wonder if this is related to having two source ids in my migrate map. Perhaps this option doesn't work if you have two source id keys configured?

I'm getting this message as well when trying a single node ID, e.g. drush mim MIGRATION_NAME --idlist=9879.

Unfortunately, adding --update at the end causes it to barf (although --update works fine without --idlist) with the error . I tried --update=TRUE and it complained that update doesn't take values.

Any help appreciated!