Imputations form displays activities, but resource no longer assigned to project

Hello All support team (wishing you a nice 19 year !)

I've got a (non-blocking) issue on imputations forms for my resources: when a resource has an expired affectation to a project, he/she continues to see some activities of this project in his/her timesheet ... but not the project. Thus the resource sees "orphan" activities (although they're really linked to the project).
For example, assuming I have project P1 and activity A1 in this project. 2 human resources R1 et R2 both assigned to A1. Assume R1 has an active affectation to P1 and R2 has an expired affectation to P1. R1 will see a correct timesheet with 2 hierarchical lines:
P1
A1

However R2 will see a time sheet with only A1 => bad

I didn't find similar query on the forum, so let me know if it's a known issue and if a corrective patch is planned. I'm using v7.2.4

Best regards