As you may see in my save, artifact is misplaced an I've activated it before saving, so it seems it respawned after loading the save game.
And another thing, after updating to 1.6.66 these save files became corrupted:
Here's message displayed when I try to load these save files:
Probably these things are related because these corrupted save files most likely were made after activating that misplaced artifact.
Windows 7 64bit
AMD Ryzen 3 1200 @3,1GHz
8GB RAM DDR4-2400 (single channel)
Nvidia GeForce GTX 1050 Ti 4GB GDDR5 (MSI GeForce GTX 1050 Ti 4GT OC 4GB GDDR5)
motherboard ASRock AB350 Pro4
Customer support service by UserEcho