Cannot add Groups from Crowd to Global or Plan permissions

Summary

Cannot add groups from Jira/Crowd to Bamboo permissions

Environment

• Bamboo 6.3.0
• Crowd User directory

Steps to Reproduce

1. Link Bamboo to Jira user directory
2. Navigate to either:
   • Administration >> Overview >> Global permissions
   • Plan configuration >> Permissions
3. Search for Group, eg bamboo-admin

Expected Results

bamboo-admin appears in the dropdown search results list

Actual Results

The below exception is thrown in the atlassian-bamboo.log file and UI:

2017-12-20 16:51:43,344 WARN [http-nio-8085-exec-7] [BambooRuntimeExceptionMapper] Unexpected error from REST call
java.lang.ClassCastException: com.atlassian.crowd.integration.rest.entity.GroupEntity cannot be cast to com.atlassian.user.Group
        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174)
	... (truncated)

Workaround

Add users individually.