Hi, just tried that but unfortunately it doesn't seem to have made any difference.
If you haven’t tried this already, another possible solution is to choose File > Optimize Catalog, in case the History problem is related to inconsistencies in the catalog database.
Hi, catalog was last optimized 19/10/2022 but this problem has been around for a while now.
Were the missing history steps performed prior to your upgrade to LR 12? Several people have reported that the upgrade lost some or all history steps:
Before, noticed quite a while ago.