https://github.com/home-assistant/frontend/pull/13212 bumped actions/stale to v5.1.0 which seems to have introduced a bug that immediately removes the stale label. According to one of the maintainers of actions/stale, it should be fixed in v5.1.1: https://github.com/actions/stale/issues/785
Example of an affected issue: https://github.com/home-assistant/frontend/issues/11659
The frontend repository has a really annoying issue template that prevents me from posting this there.