Event slots not visible in Planner > Schedule / Team > Agenda / Calendar for some users

## Event slots not visible in Planner > Schedule / Team > Agenda / Calendar for some users

**Summary**
In `Planner > Schedule`, `Team > Agenda`, and `Team > Calendar` views,
**slots are not visible to users added before a certain update**,
but the same events **are visible in the Work Schedule view**.

**What we’ve checked**

* Same browser and permissions
* Cleared filters, adjusted date ranges, all sub-calendars visible
* Affected users are older team members; newly added users can see the slots

**Request**
Please check if this is related to differences in user handling after a recent update.
Any workaround or fix would be appreciated.