Apologies for the inconvenience caused.
Please use the regex /snap.* instead of /snap* in the Exclude Disk Partitions action under Configuration Rules. The regex should match the whole disk partition name. Click Run Rule to delete the existing /snap.* partitions from monitoring.
Also, this will prevent the addition of /snap.* partitions for monitoring in the future, as long as the rule is not modified/deleted.
If you have configured multiple Configuration Rules, please check here to set priority for the rule.
Hope this helps! Let us know for further queries, if any, in the below thread.