[b18] Invisible enemy after being blinded

[Grey]

Got blinded by a shining mold, whilst waiting for it to wear off I got attacked and so moved. When I regained sight my assailant was invisible (no tile or red box showing), though there was a red box in an out of LoS area. I could tooltip over an empty-looking space next to me and see the enemy details, and we could attack each other, but there was no tile or target box for it. When I moved over towards the empty red box it disappeared and the enemy suddenly became visible and targetted.