Cannot gain bounty in converted save file

Save file converted using openmw-essimporter.exe was unable to gain a bounty.
Errors during save file conversion:

Error: unknown record REGN (0x1292e)
Warning: Skipped active spell conversion (not implemented)

Attempts to gain bounty:

• Stealing in front of a merchant or guard -> hostile vocalisations, but no change in disposition.
• Attacking a character in front of a guard -> character becomes hostile, but not nearby guards.
• Killing a character in front of a guard -> no other characters or guards become hostile.

None of the above actions caused the player to receive a bounty.

Save file was created with only the base game and expansions (Tribunal and Bloodmoon) installed.
Reproducible with a newly-created character:

1. Create new character in default Morrowind
2. Quicksave outside in Seyda Neen
3. Attack a guard (guard opens arrest dialog)
4. Resist arrest and check for bounty (40 gold)
5. Convert quiksave.ess file to omwsave using openmw-essimporter.exe
6. Load game in OpenMW
7. Attack a guard (guard becomes hostile but does not open arrest dialog)
8. Check for bounty (0 gold)

Attached save files:
quiksave.ess
quiksave.omwsave