From the meeting note:
Bodigrim: Stackage nightlies is on 9.10 and has no plans for 9.12
I think one reason that GHC 9.10.2 is still nightly- and not yet lts- is that the Stackage project is working through:
That is, I don’t think it is because GHC 9.10.2 itself is considered to be problematic in some important respect.