Could not search a Multi Linker Custom Fields

[lll lll]

Jira version :  7.13.5

Query Issues Custom Fields Plugin version: 4.0.13_JIRA7 

In this version, I could not search multi linker custom field.

Let's say I've a issue SA-2 linked to SA-1.

I've tried: 

multi_link_field in ("SA-1")

multi_link_field = "SA-1"

non of these work.  Expect result is a list includes SA-2.

And. query this will get a result, which is not expected:

multi_link_field is EMPTY and ID=SA-2