Zygopetalum with leaf damage. What’s the cause? Sunburn?

[BrassavolaStars]

Hello all,

I have a Zygopetalum with some leaf damage on a few leaves.

I don’t really care about the aesthetics of it and I am only really interested as to whether or not I need to isolate the plant.

I want to know if it’s safe to have this plant next to the other plants as space has become very scarce and I’ve been isolating this one for a bit.

I think the damaged is a sunburn as the damage happened outside during the summer and hasn’t really gotten worse.

Thank you all for all of your help with my plants so far.