Deleting the text of a RichTextLabel by changing the size of its Custom Effects array within the editor

[Sauermann]

Godot version: 3.2.1.stable

OS/device including version: WIndows 10

Issue description:

A RichTextLabel Node has a Custom Effects array, that can be changed within the editor.
When you change the size of the array, the Text of the RichTextLabel Node will be set to the empty string.
I would expect, that changing the size of the Custom Effects array has no impact on the Text of the RichTextLabel.

Steps to reproduce:

1. Create a RichTextLabel
2. Enter some text into the Text-field of the RichTextLabel
3. Open the properties of the Custom Effects array (This is the status of the attached reproduction project)
4. Change the size of the Custom Effects array (for example by clicking on the arrow-up button)
5. The contents of the Text-field disappeared.

Minimal reproduction project:

CustomEffects.zip

[Sauermann]

I tried to reproduce this bug.

Debian 3.2.3-stable-1+b1 : Bug still happens
v3.4.2.stable.official [45eaa2d] : Not reproducible
v4.0.alpha1.official [31a7ddb] : Not reproducible

Closing this issue accordingly