Entity List nearly empty, showing different entries from time to time

Home Assistant 2023.1.0 (had this probem with 2022.12 and before as well)
Node Red 14.0.1
node-red-contrib-home-assistant-websocket
HaOS all on same VM (proxmox) with official add on.

When I want to edit existing nodes or create a new node, the dropdown usually shows all entities from Home Assistant. However, since a couple of weeks, the dropdown shows no entities at all,


or only a couple of entries

sometimes up to maybe 20, but way too less.

I rebooted the system often, restarted the plugin way too often.

log_level:trace in the plugin shows nothing but

8 Jan 02:11:05 - [trace] comms.open wI10ulbimoyNIeK(…)uOqqwZrbQ=
8 Jan 02:11:05 - [trace] comms.close wI10ulbimoyNIeK(…)uOqqwZrbQ=

whenever I edit the nodes.