in your case, the "test5" was manually mirror SS, not the baseline. So its deletion won't disrupt the relationship.
>>
> snapmirror show
Progress Source Destination Mirror Relationship Total Last Path Type Path State Status Progress Healthy Updated -
---------- ---- ------------ ------- -------------- --------- ------- --------
SourceLocal:vola XDP dest:vol_dest Snapmirrored Idle - true -
This also means an existing baseline predating test5, this allows updates to continue. Because it relies on other snapshot and respect the flexclone' local on destination