The battle axe (TR_w_m4_q_AncylisAxe) you need to retrieve during the quest "Revealing the History of Fort Ancylis" is disabled until you reach stage 20 of said quest. However, according to the dialogue it has been lying on the sea floor for thousands of years, so it should clearly be present at all times. Having this kind of quest objects disabled while not working with the related quest goes against Morrowind's game design, and is something we should never do. The axe is well-hidden as it is - players are not expected to find it before being targeted towards it.

On the other hand, it would make sense for the related journal entry (stage 30) to not be revealed if finding the item before starting the quest. If fixing the script according to my suggestions, one change needs to be done to the entry 539462661850423868 of "long-forgotten history": The first journal check needs to be changed to "TR_m4_FA_FortAncylisHistory >= 20".