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That is clear. I was wondering if these artifacts drop at all. Because looking at the statistics I'm getting, some artifacts haven't dropped even once. But if an artifact has dropped at least once, it drops regularly.
I don't know the conditions under which you are doing restarts. Whether you simply call restart scenario or completely reload the game, results may differ. I provided a log of artifact drops in one of the warrior's graves on a specific map. This statistics may vary depending on the map or something else. I do not know what it depends on. Dirty_Player confirmed that this looping does take place and that it has been known for a long time. So it is not just me experiencing this.
Let's try. Map Podarok_2001, there is a warrior's grave next to the starting Castle. Due to an oversight (or perhaps it was intended), the map author did not forbid the Speaker's Hat from dropping. I want to try and find out if this map can be completed in a couple of weeks.
Below I provide data on the relics that dropped for me on this map in all graves, victims, as well as Dragon Utopia.
+Titan's Gladius
+Sentry's Shield
+Thunder Helm
+Titan's Cuirass
+Saint's Sandals
+Necklace of Bliss
+Lion Shield of Fearlessness
+Helm of Celestial Enlightenment
+Boots of Opposition
+Sea Captain's Helmet
+Sphere of Vulnerability
-Dragon Scale Armor
-Dragon Tooth Crown
-Enchanted Hat
+Sphere of Suppression
+Bottomless Bag of Gold
*Sword of Justice
*Angel Wings
*Boots of Levitation
*Tome of Fire Magic
*Tome of Air Magic
*Tome of Water Magic
*Tome of Earth Magic
*Vial of Dragon Blood
*Armageddon's Blade
All combined artifacts on the map are forbidden. Forbidden relics are marked with asterisks. Plus signs indicate those that dropped, and more than once. Minus signs indicate those that never dropped.