Upgraded from SmarterMail Enterprise Build 7523 to Build 7619 middle of last week so being quite a few versions behind we're not entirely sure when this issue was introduced in between, but if you have Incoming SmartHost Gateways that are doing all the Anti-spam tests the score is no longer being picked up by SmarterMail. Instead we get "Spam Checks skipped: IP Spam Bypassed" on all inbound messages from these Incoming SmarterMail Gateways.

In SETTINGS > ANTISPAM > IP BYPASSES disabling the setting BYPASS SPAM CHECKS for the IPs of our Incoming Gateways resolves the issue with "Spam Checks skipped: IP Spam Bypassed"...but it wasn't always this way, and is a recent change as we have had this setting enabled for our Incoming Gateways for years. I believe we had it set this way as some Incoming Gateways (such as our SmartHost Gateways) were running Anti-Spam tests but other Incoming Gateways (such as GSuite) were not. This allowed SmarterMail to know whether to accept the X-SmarterMail-SmartHostSpamWeight and skip further tests or to run Antispam checks of it's own. Somewhere after Build 7619 it won't acknowledge the X-SmarterMail-SmartHostSpamWeight: if the setting BYPASS SPAM CHECKS is enabled.