Just like the updates for Exchange Server, the March update for Windows Server also contains a serious error. The update causes a memory leak in the LSASS process, which can then lead to a domain controller restarting or crashing. Only domain controllers are affected by this problem; the problem does not occur on normal member servers. There is currently no workaround or fix. Therefore, you should not install the update on domain controllers at this time. All Windows Server versions (2012R2 - Server 2022) are affected.
The problem is described here:
All in all, not a good month for Microsoft updates. Broken domain controllers and Exchange servers together in one month, that's something new. You don't get bored with that...