The following XML should create a repro:

    <web-item key="somekey" name="somename" weight="20" section="atl.admin/admin-settings-section" application="stash">
        <condition class="com.atlassian.stash.web.conditions.HasGlobalPermissionCondition">
            <param name="permission">SYS_ADMIN</param>
        </condition>
        <label key="plugin.page.repo.ci.info.tab.label">somelabel</label>
        <tooltip key="plugin.page.repo.ci.sys.info.tab.tooltip">sometooltip</tooltip>
        <link>/somepath</link>
    </web-item>

In an atlassian-plugin.xml which does NOT have a <component-import/> tag for PermissionService. Furthermore, even explicitly component-import-ing the condition class doesn't resolve it. If the condition class depended upon several beans, you'd have to trial-and-error determine each of its transitive dependencies and add them one-by-one.

A complete example of the bugged condition can be found here: https://github.com/palantir/stashbot/blob/7226bedc0ea5e886787a46a4b31125bdda418598/src/main/resources/atlassian-plugin.xml

In this revision of the file, I tried adding component-imports fort he condition classes but it just caused things to fail silently (and frustratingly), in stash 2.6.1 the plugin fails to enable.