I'm in agreement with staying safe for the time being. I had a close call whilst exercising a few weeks back so have decided to knock the bike on the head for the time being and make do with walking. There are so many hazards in these places we like to explore and always an element of risk (one of the reasons it is enjoyable). It doesn't alway require at major slip up to require medical help.
Just up the road from my place of work is a large old mill and I've lost count of how many people I've seen mooching around with that urbex look about them. The place is a death trap with rotten floors and a roof on borrowed time. It's only a matter of time until someone falls through the rotten mush that used to be the floor. Think of the level of response that would be required from the EM services if that was to happen. None of these old places are going anywhere, I'm sure we will all have plenty of places left to explore if and when COVID blows over and very likely some fresh ones.