Looking at test_scrub_eviction_prepare.py, after a number of operations ending in a checkpoint, the btree_checkpoint_pages_reconciled stat is checked for a URI.  The original test required the value to be 1, in disagg it is 2.  We should understand the difference.

I would think that two would be correct, we're reconciling a leaf page and some internal/root page.

Rather than disabling the test, I'm making a change to allow for 2 in disagg, but we should make sure there's not a bug, or a performance miss.