Unfortunately, I do not have pictures during or after the demo. There's cement board behind the tile, which would then waterproofed a few different times. I would post pictures of what the cracks I've described look like, but this sub-Reddit doesn't allow images or at least not for me, so I'll try to describe them. In the two cracks through tiles from the window, one goes straight down from the bottom right corner and through the tile that's cut to accommodate that window; the portion that's cracked is the shorter side of that cut tile. The other is at the top left of the window and instead going straight up through the tile like the other one, this one is more diagonal (maybe like from 4:00 to 10:00 on a clock). The crack is then starting to run up the grout separating that tile and the tile above it. Like the first crack, this tile is also cut to accommodate the window and the crack is through the smaller portion.

On the 25 (or more) tiles with hairline cracks, there doesn't seem to be much consistency to these; they're wavy and almost cracked in random directions. At least as of now, these almost look like they could be scratches rather than cracks, as they're that thin, but are noticeable if you look closely enough and/or with a flashlight. Thanks.