My guardian farm, built back in version 1.8, now has guardians spawning outside the previous temples bounding box to the North and West up to nearest chunk border.
Updated info as requested: Seed= -8159456647961895926 Coords: -880 112
1.17.1 world save: https://drive.google.com/file/d/1js7HGS9LgwT_5K1-cIHLg9V4m0EMQk6d/view?usp=sharing
The world was originally created in 1.8.1 and has been updated throughout the years.
We'll need at least a seed and coords to act on this. If possible, please attach your world save (use Google Drive or OneDrive and create a share link if its too big).