In Crowd 1.x, SAL could store properties against arbitrary keys. As of 2.x, these keys are prepended with "plugin."
After migration, the "plugin.example" key is attempted to be read, but the "example" key is what's in the database.

Here is some example original data:
<salProperties>
<salProperty>
<key>example</key>
<propertyName>some.property name</propertyName>
<propertyValue>some property data<propertyValue>
</salProperty>
<salProperty>
<key>null</key> <!-- null string is global scope -->
<propertyName>com.atlassian.example:build</propertyName>
<propertyValue>2</propertyValue>
</salProperty>