Can't pickup the dead mage's journal from the mysterious hunter mod
If you get far into the shack added by the mod in Seyda Neen and fight the vamipre near the level 100 locked door, you'll find a dead mage with a journal beside him, for some reason that journal can't be picked up and instead you get a journal update, the journal update says it's needed to be delivered to the mages guild but if you try to pick the journal again you won't be able to.
I'm not sure if that's intended to happen or not but if you "additem" the mage's journal into your inventory and go deliver it you can complete the delivery quest, and if you read the book before you deliver it you also get a skill level up, so I don't think so.
Relevant openmw.log entries:
[12:27:42.374 I] Warning: MH_Journal_Reward line 20, column 20 (AddTopic): Stray explicit reference
Here's the mod: https://www.nexusmods.com/morrowind/mods/44336
And a new save made to test this mod and for convenience:
I haven't tried the mod in vanilla to see if it behaves the same.