I'm trying to complete the EDZ Major Fieldwork for act 3. I was able to do the final Minor Fieldwork that I needed to do to unlock the EDZ major fieldwork, and was able to pick it up along with the apothecary table showing up in the EDZ. However, when I go to the table there is no prompt to start the mission. I saw reports of this on Reddit as well with multiple people having this issue with multiple of the Major Fieldworks having the same issue. Seems to be a bug after Heresy's launch.