Unable to create a new line/row in grid field after adding a new language

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.3.1 CE GA2, 7.3.2 CE GA3, Master
• Component/s: Forms
• Labels: None
• Fix Priority: 3
• Sprint: Forms_7.3_20
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/86631

Description
Unable to create a new line/row in grid field after adding a language.

Steps to Reproduce

1. Go to Content & Data > Forms;
2. Add a Form;
3. Add a grid field;
4. Add some rows and columns;
5. Add a new language (e.g. Portuguese);
6. Rename the rows and columns in the new language selected;
7. Return to the original language;
8. Add a new row or column.

 Expected Result
A new row or column should be added.

 Actual Result
A new row or column is not added.

Reproduced on
Commit: 9876741a5f9507f609fd1d57003b2cb3d84e4283
Updated on: Thu Mar 12 22:22:31 2020 -0700