"enabling the mitigation may break something, but Microsoft won't tell its customers what it could be. Administrators need to find out by themselves therefore, which is a problem, as Microsoft does not give any hints what to look for. Administrators may spend hours evaluating systems to find potential breakage."

https://www.ghacks.net/2023/06/17/microsoft-enabling-kb5028407s-security-patch-could-break-something-but-we-wont-tell-you-what/