Kie server sync deploy (KIE_SERVER_SYNC_DEPLOY) makes sure that all containers are initialized before the application server/pod is started. Default value of this property in scripts is true.
However Kie server templates   disable this property, probably leftover from LA. This may become an issue as requests can be redirected to Kie server without fully initialized containers. I suggest to delete this property from templates so default value can be applied.