Counter-intuitively, the heat shield was not permeable enough during Artemis I. This led to gas buildup, higher pressures, and the cracking ultimately observed. The IRT was concerned because, as designed, the heat shield for Artemis II is actually more impermeable than the Artemis I vehicle.

That doesn’t sound promising. I guess they redesigned the entry to be quicker, but it’s a little concerning that the Artemis 2 heat shield is likely worse than the Artemis 1 shield.