Forms Rule does not update empty field value for field that triggers the event

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.X
• Fix Version/s: 7.1.10 DXP FP13, 7.1.X
• Component/s: Forms
• Labels:
  • ee-ts
  • liferay-fixpack-dxp-13-7110
• Branch Version/s:
  7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay/liferay-portal-ee/pull/15439

Steps to reproduce

1. Navigate to Content > Forms
2. Add a data provider as the following:

   Name:zipcloud
   URL:http://zipcloud.ibsnet.co.jp/api/search?zipcode={zipcode}
   INPUTS:
   Label zipcode
   Parameter zipcode
   Type Text
   Required enable
   OUTPUTS:
   Label prefecture
   Parameter $.results[0].address1
   Type Text
   Label city
   Parameter $.results[0].address2
   Type Text

3. Add a form named "Address"
4. Add 3 text fields named "Postal code", "Prefectures" and "City"
5. Save the form
6. Add a rule as the following:

   Condition:
   If "Postal code" "Is not empty" and "Prefectures" "Is empty"
   Actions:
   Do "Autofill" Form Data Provider "zipcloud"
   Data Provider's Input:
   zipcode "Postal code"
   Data Provider's Output:
   prefecture "Prefectures"
   city "City"

7. Add a form portlet to any page and set "Address" form
8. Input "1500000" to "Postal code" field
9. Make sure that "東京都" and "渋谷区"is auto filled to "Prefectures" and "City" field
10. Input empty value to "Prefectures" field

Expected behavior:
Since Postal code is not empty and Prefectures is empty, the rule should be satisfied and "Prefectures" field should be autofilled.
(This is the current behavior on branch master)

Actual behavior:
"Prefectures" remains empty, and after clicking submit button "Prefectures" is autofilled.