I have the exact same issue.
I tried AJAiDS solution but it didn't work for me unfortunately...
Replacing the file with his or editing it on my own, both didn't work.
I even tried to delete mzp_mand11.utc from bos_msp3.mod and thought that would delete the Mandalorian Scouts on this level, thus making them not spawn at all and hoping to not encounter the game crash. All units, the OP described, still spawned and the issue was still there.
Any solution or way to skip that part please?
******************************************EDIT*************************************
I HAVE SOLVED THE ISSUE
*** I think AJAiDS file works but for me it didnt and i think i know why.
My save was actually infront of the door where the bug happens. While editing the files and replacing them, the game somehow didn't take the changes eventhough no matter how many times you restart / reload the game.
PLEASE RETRY AJAiDS file and load a previous save which is one or more area before the area where the game crashes. You have to be in a previous area and enter the bugged one, the game needs to load the area to accept the changes to the file.
For my case, i actually further modified the file and used a previous save. So im not sure if my changes helped for the issues but let me mention what i changed, incase someone cant fix the issue and should try to changes these following things first and see if it works:
1. Extract bos_msp3.mod to a folder using Kotor Tool's 'Extract entire ERF file' button.
2. open mzp_mand11.utc
3. copy this: msp_mandstand1 and paste it in mzp_mand11.utc TAG
4. change the appearance to Alien_Mandalorian_01
5. click down left corner on the INVENTORY button, you will see 4 items down right, select the ECHO line and press DELETE
6. SAVE CHANGES
7. open mzp_mandalore.utc, if the appearance box is RED, select Alien_Mandalorian_01 to eventually prevent a crash when meeting mandalore.
8. SAVE CHANGES
9. Open Kotor Tool's ERF/MOD Builder from Tools.
10. Click Add Dir... and navigate to folder from step 1.
11. Browse Output file name to folder from step 1 then choose name as bos_msp3.mod.
12. Select Output file type as MOD.
13. Click on Build MOD. (If Build MOD is grayed out, try changing Output file type to something then back to MOD).
14. Navigate to swkotor install directory.
15. Make a backup of bos_msp3.mod file in the modules folder, then replace that file with the one created.
It's frustrating to meet game crashes and desperatly searching for a fix. But having found a solution and experimenting around is always fun.
Good luck to all of you!