Ran three T11 bountiful delves after reset today. Earthcrawl Mines, Sidestree Sluice, then The Spiral Weave. The first two had all rewards as expected (even one hero chest from the map). However, the spiral weave was missing its guilded chest with the 7 crests. It had everything else - two smaller blue bountiful chests, bountiful coffer, nemesis chest. I opened a ticket with support but they just told me to open a bug as they have heard this issue a number of times now.
Same issue today. 2nd and 3rd delve were missing the gilded chest. Also haven’t reached season cap. Submitted bug report.