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The game crashes on the "Gift" map. Through experimentation, it was discovered that a specific cell causes this behavior. Even opening it in the original game results in a crash.
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2 The_Mafia:
In the World Tree (WT) there is a script that changes the terrain in underground battles to the appropriate one; this is the so-called Inferno script (the second to last one in the script91.erm file).
It works as follows: before the battle, it moves the coordinates of the battle location to the surface and changes the terrain type to the required one; after the battle, it restores the old terrain type on the surface cell.
It is likely that on one side, the battle coordinates did not change, which is why the battlefields are different.
I think it would be easier to fix this bug by patching the WT executable. This script was one of the first I created, and it more or less coped with its function when playing without the HD mod. Although, even then, bugs occurred, but I corrected it as I remember.
It should be noted that this script is necessary for mirror templates, so it cannot be completely removed.
You can try asking Wizard how he solved the terrain type problem in underground battles for the Sodo mirror.
In my opinion, many WT incompatibilities with HD are easier to fix on the WT side if that is the goal. In particular, the incompatibility of HD with mirror templates. If anything, the source code for the mirror is still intact.
Moreover, there is also a bug with the automatic battle.
PS
I assumed that since the bug occurs when a mod is connected, it means the mod is influencing it, and in that case, I would have to patch the mod itself, possibly its DLLs and not the executable. That's why I wrote here.
The_Mafia, there's not much point in patching HD. I'm currently a bit busy developing new features for HD 5.0 and in general. Perhaps after the release, or maybe right before the release of 5.0, I'll work on the WoG/ERA module for HD and remove everything unnecessary from it (everything that has been dragging on since the time when the code for SoD/HoTA/WoG ERA was one). It is quite likely that the problem will disappear; if not, we will still figure it out.