When new Tags or Sorting Layers are created in the Preset file of "Tags & Layers" then they are not getting created and added in the list.

Steps to repro:
1. Create a new project
2. Edit > Project Settings > Tag and Layers
3. Create preset of Tag and Layers
4. Project window > Tag Manager Preset > Inspector >Tags > (+)

Actual Result:
New Tags and Sorting Layers are not created and added in the list in its preset file

Expected Result:
New Tags and Sorting Layers are added gracefully in the list of Preset of "Tags & Layers"

Occurring on:
2020.2.0a20, 2020.1.1f1, 2019.4.7f1, 2019.3.15f1, 2018.4.25f1

Environment:
Windows 10 and Mac 10.14