Form submission request missing parameters of specific type

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.2 CE GA3, 7.0.0 DXP FP8
• Fix Version/s: 7.0.0 DXP SP2, 7.0.0 DXP SP3, 7.0.3 CE GA4, 7.0.0 DXP FP23, 7.0.X EE, 7.0.4 CE GA5, Master
• Component/s: Frontend Infrastructure
• Labels:
  • QA-NF
  • liferay-digital-enterprise-70-sp3
  • liferay-digital-enterprise-70-sp5
  • liferay-fixpack-de-13-7010
  • liferay-fixpack-de-23-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/49930

When submitting form not all parameters are submitted; button and input type="submit" parameters are not included with request

<form action="<portlet:actionURL><portlet:param name="action" value="regList"/></portlet:actionURL>" method="post" name="fm">
	<button type="submit" name="<portlet:namespace />button" value="Button" >Button</button>
	<input type="submit" name="<portlet:namespace />submit" value="Submit" />
</form>

Steps to Reproduce:

1. Deploy attached war
2. Add "Sample Sign In" portlet to page
3. Click the "Button" button
4. Click the "Submit" button

Expected behavior
Button : Button
Submit : Submit

Actual behavior
Submit :
Submit :

Reproduced
Master : 13036db918c5f3b42c26050b30eb3d8434fec28f