Not sure if a bug but my scientist worked almost 10 years (I think it was cracking the egg special project) but he got seemingly no xp during this time.
1. What platform are you using?
Xbox Series X
2. What version of the game are you using?
3.9.3 (Xbox Release)
3. What DLC do you have installed?
All of them, including C6 portrait
4. When did this start happening?
Immediately
5. Can you replicate it, if so, please explain how
Always so far
6. Does this happen on all saves or just specific ones?
All saves so far.
7. What steps have you taken to try and solve this yourself (reinstall, Google error code etc)?
N/A

1. What platform are you using?
Xbox Series X
2. What version of the game are you using?
3.9.3 (Xbox Release)
3. What DLC do you have installed?
All of them, including C6 portrait
4. When did this start happening?
Immediately
5. Can you replicate it, if so, please explain how
Always so far
6. Does this happen on all saves or just specific ones?
All saves so far.
7. What steps have you taken to try and solve this yourself (reinstall, Google error code etc)?
N/A