Problem

how to reproduce:

We have a user with clientPM role (and others) assigned customer A.
We have a task which is assigned to customer B

And we have a job for the user in the task.

When user now tries to open the task, this ends up in the error shown in the TS-issue.

Problem here is a missing "rights-check" if user has an assigned job for the task.

Solution

grant access to tasks where user is assigned to (TUA, job assigned)