Game crashes, missing horses

When I exited out of my Minecraft world yesterday, the “software crashed because of an error”, and the same thing happened just now when I had just logged back in. I had three horses attached to fence posts outside my base, two of whom had saddles on. When I checked on them, the horses with saddles were gone but their leads were still shown on the fence, though the horse without a saddle was still there. I tried removing a lead from a fence and exiting the world, but they were still gone. For context, the world was created in the old Nintendo Switch edition and I ported it over to Bedrock, so it’s somewhere around 270 MB large.