Under Test Plan, when added more columns for Test Executions, gives error

Description: Under Test Plan, when adding more columns for Test Executions, it gives an error.

Pre-conditions: NA

How to reproduce

1. Create a Test plan.
2. Add a Test Execution under it.
3. When adding more than 70 columns under the Test Execution section of the Test plan, it gave a 400 error as shown. 

Actual result/Attachments: 

Expected result: Columns should appear.

Version

• 8.2.1

Workaround: NA