There is unsupported plugin https://marketplace.atlassian.com/plugins/com.atlassian.bamboo.plugin.requirementtask/server which was released as workaround for https://jira.atlassian.com/browse/BAM-13499. Now it's core Bamboo functionality and people need to migrate data from plugin to Bamboo core.

We should release new version of plugin with upgrade task to migrate data and disable plugin