Osgi plugin wipes out JAR attributes

The doc says:
If the Java plugins is applied, the OSGi plugin replaces the manifest object of the default jar with an OsgiManifest object. The replaced manifest is merged into the new one.

It appears that all attributes added to JAR manifest before applying OSGI plugin are just ignore.

Here is the test build.gradle

apply plugin: 'java'

jar.manifest.attributes(dummy: 'dummy-value')
println "Attributes = " + jar.manifest.attributes

apply plugin: 'osgi'
println "Attributes = " + jar.manifest.attributes
println "Instructions = " + jar.manifest.instructions

classes << {

Console output:

C:\...\jar-osgi-test>gradle build
Attributes = [Manifest-Version:1.0, dummy:dummy-value]
Attributes = [Manifest-Version:1.0]
Instructions = [:]
:compileJava UP-TO-DATE

Content of MANIFEST.MF

Manifest-Version: 1.0
Bundle-SymbolicName: jar-osgi-test
Bundle-Version: 0.0.0.unspecified
Bundle-Name: jar-osgi-test
Bundle-ManifestVersion: 2
Bnd-LastModified: 1450192516497
Created-By: 1.8.0_66 (Oracle Corporation)
Tool: Bnd-

My ‘dummy’ attribute is lost with OSGI plugin.

Same behavior in 2.10rc1 && 2.11 (nightly)