NOTE: I'm asking if this material property is ever considered. I'm not asking "do you think it should be considered". I'm pretty sure someone has considered it, and I am hoping to track down some information on that - a report, paper, even an anecdote. As a whole, people who launch rockets are an extremely cautious bunch and rarely if ever think "well that probably won't matter so we better not calculate it." One might look at this article before saying there is no effect. Hunting the "free" internet (not behind a paywall) for the susceptibility of LOX, I found a value of Chi=0.0035 here which isn't really "small" at all!
In this answer to this physics question I found a link to this YouTube video where liquid oxygen is poured between the poles of a laboratory permanent magnet. Liquid oxygen sticks between the poles, holding against gravity and the pressure of the boiling at the pole surfaces.
I was as surprised as the guy in the video!
Since LOX is "magnetic" (colloquial use), are there design considerations in the tank, transport, and engine? Components themselves might have magnetic fields - motors and solenoids for example. In the "weightlessness" of orbit, is there any significant interaction between a partial tankful of LOX and the earth's magnetic field?