selectionchange events fired when using multi tinymce editor in page

[zhaozhongyu]

What is the current behavior?
i am trying to use multi editor in the same page, and one of them add selectionchange listener. but when i click the one have not listener, selectionchange event fired.

Please provide the steps to reproduce and if possible a minimal demo of the problem via codesandbox.io or similar.
https://codesandbox.io/s/tinymce-test-ier70z

What is the expected behavior?
selectionchange event should be only fire in the editor which add event listener.

Which versions of TinyMCE, and which browser / OS are affected by this issue? Did this work in previous versions of TinyMCE or tinymce-vue?
@tinymce/tinymce-vue@5.1.0