Json editor has a limit on chars

[hashashin]

Describe the bug
When editing manually the json of a button there's a limit beyond the editor dont let paste or ad more text, outside the editor you can add more actions and the json gets updated.

To Reproduce
Steps to reproduce the behavior:
json example where if you try to add text manually nothing happens
https://gist.github.com/hashashin/c62e6e34bb2fe0b68dacbac90557fa7e

Expected behavior
The editor should not have a limit in chars?

Sorry for my poor english.