I'd be asking the neighbours if they've heard any disturbances from your tenants. Looks like that walls had a good whack. Plasterboard underneath damaging as well i think has caused the transfer onto adjacent tiles.
The first photo is from a wall that is not hit by the door.
The second is from the door wall but is on the other side of the room.
Yes it's a rented property.
Re depth of adhesive, I would have to ask the tiler. Looked to me like he used alot.
Use of rapid set on certain soft biscuit tiles with glass glazing can result in crazing of the glaze and maybe worst case scenario is cracked tiles , but never seen them bulge like that, remove the affected tiles and examine substrate and adhesive bed.
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Nice forum you have here. Seems very helpful. I have some work coming up soon so will post in the more relevant forum.
I hope your businesses are flourishing!
Be well