Not sure if I found a bug: when I add my HVACs to a scene and call it, I get the following error message:
Logger: homeassistant.components.websocket_api.http.connection
Source: components/websocket_api/commands.py:281
Integration: Home Assistant WebSocket API (Dokumentation, Probleme)
[547233746368] The preset_mode none is not a valid preset_mode: boost, comfort, eco
I think to remember having seen this error already after the last major release when in automations calling HVACs, but it got fixed there. So maybe this was overlooked in scenes?