Update to my previous post above. After charging my phone overnight, it required the usual password after four hours of inactivity. My location has been the same since the previous fix. After that, it wouldn't unlock via "Smart Lock" until I did the wipe cache partition thing again, so unfortunately this wasn't permanent either. Pretty much ready to give up on this feature at this point. I might chat with Samsung again, but I doubt it'll help.
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Chatted with a Samsung+ person, and told them I've tried restarting in safe mode, adding additional locations, deleting and re-adding locations, and other things with it only working for a bit, and always stopped working when travelling out of and back into a trusted location. They told me to do a "wipe partition cache", and so far so good. Sounded scary, but it essentially just clears the cache completely, I think more so than just clearing the cache of individual apps or in the storage settings does. Power off the phone, hold the bixby button, volume up, and then the power button. Once it starts, release the power button. Then use the volume keys to navigate to wipe cache partition, and the power button to confirm, then reboot the phone. I think the instructions to do this are different if you have a different Galaxy phone, mine is an S9 with that stupid Bixby button. Hopefully that helps someone else, I'll report back in a day and see if this is still working.
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