Honey pro home stays active, although sensors are not

Within my Homey Pro-2023, the highest level in the space hierarchy (Home) remains active. Below the top level, two floors have been configured containing various rooms with devices that can trigger activity. These all function fine and as soon as there is no more activity, they neatly revert to “not active” and neatly show how long ago there was activity.

In rel. 12.2.1 the change log states the following:

Fixes an issue that could cause zone activity to get stuck in a certain state after removing a device.
Does anyone recognize this or know what could cause the highest level to remain active?