Repeatable HTML field becomes empty upon reorganization with drag&drop using CKeditor

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Fix Version/s: 7.2.X, Master
• Component/s: Dynamic Data Mapping
• Labels:
  • ee-ts
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/82773

Reproduction steps:
The issue is only reproducible with ckeditor
1) Start DXP
2) Login as admin
3) Go to: Content->Web Content-> '+' button -> add Basic Web Content -> Structure -> Create new structure
4) Add a HTML box with the attribute => repeatable = yes
5) Create a new Webcontent of the new created structre
6) Write some text to the first html box
7) Add a second html box via the '+' Button => write some text to it
8) Reorganize the blocks with drag & drop

Expected behavior:
Content boxes holds their value and the editor instance is still functional
Actual behavior:
After drag & drop, the HTML field is empty and the ckeditor toolbar throws null error

Reproducible on Master @e261559fbdc7
Reproducible on 7.1.x @68d1a7bf45aa4
Reproducible on 7.0.x @445ecc31b2fe4