Thanks for checking our game out!
You're right, there's a bug in the game where the old 'default' instructions don't get wiped properly, so the raiders always keep the original strategy in mind regardless of any changes.
We released a post-jam version of the game where this bug is resolved, feel free to check it out here!
https://tobiashenriksson.itch.io/slaves-to-the-meta-post-gmtk-game-jam-version