After retrieving the Death Mask, TR_m3_OE_TG_MaskGuard01 forcegreets the player to retrieve the mask. If the player complies, he wipes the player's bounty using PayFine. This also removes all stolen items from the player's inventory. Judging from the dialog, this is not intended - forcing the player to drop all their stolen items, then talk to the guard, then pick them all up again.

Suggested fix: replace PayFine in the dialog by PayFineThief - the variant that doesn't strip the player of stolen items.

The specific dialog line is in Greeting 0, "Thank you for your cooperation. I will deliver this to his lordship. You have done a great service to the Imperial government. I will send word to the jailors that the transaction has been completed and Fentus is to be released. You and Moranie can go now." Result box is this:

player->removeitem "T_Imp_UNI_KatariahsDeathMask" 1
ModDisposition 20
SetPCCrimeLevel 0
PayFine    <-    change this to PayFineThief
Journal "TR_m3_TG_Moranie3" 105
"TR_m3_Capn Fentus"->disable
"TR_m3_Moranie"->PositionCell, -190, -48, -211, 180, "Old Ebonheart, The Empress Katariah"
"TR_m3_Moranie"->AiWander 0 0 0 0 0 0 0 0 0 0 0 0
"TR_m3_Naamalvu Erendi"->PositionCell, -280, 262, 26, 270, "Old Ebonheart, The Empress Katariah"
"TR_m3_Naamalvu Erendi"->AiWander 0 0 0 0 0 0 0 0 0 0 0 0
"TR_m3_Three-Scales"->PositionCell, -560, 138, 11, 180, "Old Ebonheart, The Empress Katariah"
"TR_m3_Three-Scales"->AiWander 0 0 0 0 0 0 0 0 0 0 0 0
"TR_m3_Yggulf the Mute"->PositionCell, -498, -28, -244, 270, "Old Ebonheart, The Empress Katariah"
"TR_m3_Yggulf the Mute"->AiWander 0 0 0 0 0 0 0 0 0 0 0 0
"TR_m3_Yggulf the Mute"->SetHello 0
Goodbye