'was also discussed' is correct and usable in written English. You can use it to refer to something that was mentioned in a previous conversation or discussion. For example: "The new company policy, which had caused some concern, was also discussed during the meeting."
Their stability was also discussed.
Initialization process was also discussed.
Moreover, the seeded growth was also discussed.
Possible crystal growth process was also discussed.
The possible formation mechanism was also discussed.
The sensing mechanism was also discussed.
The structure activity relationship was also discussed.
Furthermore, the CL mechanism was also discussed.
PAM's modification mechanism was also discussed.
The provision of "girls" to the judge was also discussed.
Polluted water in some areas was also discussed.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com