Repeatable web content structure items causes error and block publishing

Issue

• Steps to Reproduce:
  1) Take Liferay 7.1 and install fix-pack dxp-14.
  2) Connect with MySQL 5.7
  3) Create a structure with two text fields
        a) Add one text field 1 - make it repeatable
        b) Add another text field 2 as a sibling of the above text field - make it repeatable
  4) Create a template
        a) Loop through text field 1 - print text field 1
        b) Inside the above loop, iterate through text field 2 and print text field 2                                    

  5) Now Add Web Content using the above-created Structure.
  6) Add 8 text fields for field 1 and inside every 8 fields add 6 fields except in the 8th field add 7 fields.
  7) Click on Publish.

  Observed Behavior: Web Content is not saved.
  Expected Behavior: The Web Content should be saved.

Environment

• Liferay DXP 7.2
• Liferay DXP 7.1

Resolution

• The observed behavior is a known bug and fixed in Liferay DXP 7.1 with Liferay-fix-pack-dxp-17 and above.
• The observed behavior is a known bug and fixed in Liferay DXP 7.2 with Liferay-fix-pack-dxp-4 and above.
• Installing Fix Packs and Hotfixes on Liferay DXP will guide to install these Fixpack in your environment.