aui button does not render when used with FreeMarker

• Type: Bug
• Status: Verified
• Resolution: Unresolved
• Affects Version/s: 7.0.0 DXP FP7
• Fix Version/s: None
• Component/s: Frontend Infrastructure > UI Taglibs
• Labels:
  • QA-TBD
• Fix Priority: 2

tag lib defined in init.ftl

<#assign aui = PortletJspTagLibs["/META-INF/liferay-aui.tld"] />

<@aui.input label="name" type="text" name="name" size="40" inlineField=true/>
Works correctly, as do other aui tags

<@aui.button type="submit" cssClass="btn-info" value="save"/>

(or any use of aui.button) does not render at all, nothing in the DOM