In scenario like configuration sync between DC and DR, it would help if "No XMLRPC Sync" flag (likewise in Virtual IPs) is provided in "Aliases" also to explicitly instructed OPNsense to exclude it from replication.
There are policies to replicate from DC to DR where common alias name are used pointing to different content and DC -> DR sync would break required configuration at DR side.
An example maybe where Source NAT is used to let LAN side traffic go out of Alias named "AddOn_IP". For DC & DR, content of AddOn_IP may be different policy should stay same.