Hello again, thanks for your answer.
I'm not sure, that I understand you correct. Did you mean that very small qty of mineral veins is normal for WoW on MaNGOS? I asking, because about ten years ago I tried to use a Mangos server for WoW 2.4.2-2.4.3. That wasn't pure Mangos, that was a kind of fork, named AmberCore or something like this. It was for Windows (it ran on WinServer 2k3 in my case), and it used MaNGOS 0.11 (maybe not pure, but also a fork, here is the screenshot of realmd (I found server files in my archive)). And with that server, game spawned a lot of mineral veins and herbs. For example, here is two screenshots - from WoW 2.4.2 on Mangos 0.11 and from WoW 3.3.5a on Mangos 22.1.1. On first there is alot of mineral veins in Boulderfist, and on second there is nothing. What of this two cases is that correct representation of original game?
Also, I execute your requests to db. As you said, this isn't trouble of db - there is 1521 gameobject of Tin Vein in it, and their records seems correct (i.e., they have correct coordinates, rotations and so on).