This is not a bug, mirrors and kegs are not entities.
I've investigated the possibility of modifying this but it's a non-trivial matter, given how things are drawn in DROD. The best i could do is draw those under all T-layer items, so under checkpoints, scrolls, fuses, etc. Making it so that they are drawn exactly between the floor-level T-layer items and the ones that are slightly above would required breaking the current rendering pass into two, and inject ghost mosnter rendering in between.
If you really want this make a feature request but I wouldn't be too hopeful that this will be implemented anytime soon. This stuff is complex.
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