Overproofed, I suspect. Overproofed bread also tends to be a bit pale as in photo.

Because the over-proofed bread had risen so much before it hit the oven's heat, there was no more capacity for additional expansion in the oven. It rose; it fell; it collapsed. Still tastes good, but not a pretty picture.

https://www.kingarthurbaking.com/blog/2018/02/21/over-proofed-bread