Liquid oxidizer tank eats liquid hydrogen

Shouldn't it leak, damage the equipment or pipe and immediately vaporize?

What is the problem? It was always like that - when you pump wrong fluid into the rocket tank the fluid gets destroyed. 

Same works with gases - if you pump any gas into CO2 rocket it will destroy any but CO2.

It is actually a nice feature rather than a bug.

But does it actually destroy the element? In other instances the element just leaks into the environment, it seems strange that it would delete the input just in this case. Of course the extremely sensitive liquid will heat up and become gas quickly, so one might not see it. Anyone tested that?

Let me test it.
In a vacuum, the hydrogen just flows out onto the floor.
Only the game strangely render a small amount of hydrogen.
Naturally, if in a normal game rockets are built in a space biome, the hydrogen will be immediately destroyed by the Space exposure effect.