This is a satellite photo of Lenice from 1/19/2023 and it looks like it was mostly ice-free on that date. It could have re-frozen since that date or that may be very clear ice that looks like open water. I can't see anything more recent due to the cloud cover. (I'm looking at photos from the Sentinel Hub EO Browser.) The best way to know for sure is for someone to hike in there and see what it looks like in person.