Phallenopsis: Mesophyll Cell Collapse? Thrips?
 

Hi everyone!
So the story is that I went on vacation for 8 days, and when I came back, I found one of my orchid's leaves with symptoms of what I thought was mesophyll cell collapse. Because the damage was all over the leaf, I decided to remove it without a more careful inspection (bad idea).
A few weeks have gone by, and now it's happening again, even though I've been more careful with my plant's care.
At the back of the leaf, I noticed a big brownish spot with small white spots around. Also, there are two cocoon-like lumps and a hole(?). See pictures attached.
These signs are making me think that this might be caused by bugs, but I am not sure about it.
Also, I removed some of the substrate to make a closer inspection of the roots, and though they seem old, I didn't find signs of rot.

Does anyone knows what might this be? Any help would be highly appreciated.

Thank you!

That looks like sunburn or thermal burn. Phals. don't ever need sun shining on the leaves.

The one leaf has been folded until it cracked.

The longitudinal cracks along the leaf centers are from not enough water.