What causes this pair of icons?

Many of my switches showed this pair of icons after a core update (core-2022.3.5). Clicking on them brings back the switch icons.

(It appears that they were all MQTT switches).

Should I worry or just ignore it?
icon

It’s caused by home assistant not knowing the state of the switch at start-up. There’s an issue open about this

That makes perfect sense. I just hadn’t seen this before.