This post should hopefully help you understand what is and what is not protected by VCHA and also what to expect depending on the situation.
For more on VCHA please see my previous posts:
Tag: vCenter Server Appliance 6.5
vCenter HA Gotcha’s (vSphere 6.5)
There are a few gotcha’s and known issues that I have found with vCenter HA. Hopefully the following will be of use and avoid the need to engage VMware Support to resolve.
For more on VCHA please see my previous post which also includes short videos of both deployment methods.
have you tried reinstalling? 