Eek! It does look microwaved. Likely those zones will get soft and decay. I’d be standing by with a razor blade to trim them off at a moments notice. It’s good sign that there was new growth below the clear zones burnt. And it highly suggests exposure to something external that it has clear zone lines
More details are likely needed here ----- as in history. Eg. was the orchid in that growing area for a long time? Or did it just arrive, such as by shipping. And if it was in the growing area for a long time, then were there any relatively fast temperature changes, or was there any extreme temperature event (cold event, or very hot event). etc.
At this time, I agree. Maybe could apply some systematic ------ no guarantees. Eg. copper spray.