I believe a sanitisation task is created for desks in certain scenarios, such as when a desk booking is deleted, bumped or released, and for block bookings. In the case of a booking being deleted or bumped this means a cleaning task is created even if the desk is not used. This seems reasonable as it is better to be cautious in the current climate.
However for a booking that is not checked-in and not bumped, because the bump option is not enabled, a cleaning task is not created (or at least doesn't appear so) even though the desk was possibly used.

Would it be an idea to ensure a cleaning task is created for all desk bookings?
We don't normally use the bump option as there are so few people attending the office that there is no pressure on desks.
While it might potentially create cleaning tasks for desks that haven't been used - this is happening anyway in the case of bumped bookings.