There seem to be 2 bugs with rust popping up in vasiliy's fork (probably common to LIVAN as well)

1) I changed the material of my helmet and my body armor. Neither one was rusty previously. when I change the material, it's fine, but when I take another step, they are suddenly "very rusted"
2) when I repair these very rusted items either with a smith or a scroll of repair, they are fine, but a few steps later they are suddenly very rusted again.

Sad, it's dropping my helmet AC from 33 to 20 and armor from 41 to 21

hm. tnx. have to investigate this issue.

can you tell me what exactly i should do to reproduce this?

I'd imagine that it'd be easy to test in wizmode. Wish for a helmet, wish for an socm, use it to make the helmet something rather nice but rustable like steel or whatever it is cap is actually making stuff into, walk around a bit and see what happens. Then if that reproduces, wish for a scroll of repair and use that, then continue walking around.

Part of me was covered in blood, which probably had something to do with it.

The helmet was a helm of brilliance - unicorn horn? The armor was the shirt of the Jaguar - phoenix feather I believe. Neither material is rustable but both had been covered in blood. When I changed them both into adamant, they both turned instantly rusty. So I think the game was keeping track of their rust, even though they were immune to it.

i am not sure, but i remember (i think) that there were some bug with resetting rust counter. and btw -- blood is like an acid: it eats alot of materials. those things was inherited from LIVAN.

but anyway -- i'll take a look at it. hope to fix it before 2487... sorry, 2256... sorry... 2132. ok, ok, 2058.

sorry, i'm still can't reproduce the bug. i tried alot of times, but never got this bug. hope it just rusted and disappeared.