Yeah your tiles are cracking fully I think.
As they're already shot, and the job needs to be redone, would you feel comfortable perhaps pushing one of the tiles on a breaking point and see if it comes off? Perhaps do the bit not in the shower?
Only do this if you're comfortable and this suggestion isn't going to cause more issues.
I'd like to see if you can confirm the tile is broken right the way through. That doesn't appear to be surface crazing of any form. I think they've broken.
Funny how it's near the pipes where heat is too.
As they're already shot, and the job needs to be redone, would you feel comfortable perhaps pushing one of the tiles on a breaking point and see if it comes off? Perhaps do the bit not in the shower?
Only do this if you're comfortable and this suggestion isn't going to cause more issues.
I'd like to see if you can confirm the tile is broken right the way through. That doesn't appear to be surface crazing of any form. I think they've broken.
Funny how it's near the pipes where heat is too.