Running migrate:import for node entity with --update modifies CHANGED timestamp

fwiw, I found changing from source field timestamp to source field changed worked for me, no patches needed.

Q: is there any downside to altering the code to configure the code to default to changed: changed instead of changed: timestamp ?

So I was aware of something that update the changed date. But thanks to this issue now I know it's when I use --update

But I'm here from this issue https://www.drupal.org/project/drupal/issues/2329253 📌 Allow ChangedItem to skip updating the entity's "changed" timestamp when synchronizing Fixed

And someone made a patch for my 10.3.x branche I'm using here https://www.drupal.org/project/drupal/issues/2329253#comment-15705835 📌 Allow ChangedItem to skip updating the entity's "changed" timestamp when synchronizing Fixed

With this patch my changed time is not updated with migrate --update