Curve preview doesn't update on reverting changes after changes were canceled for FBX animation importer

Steps to Repro:
1. Create a new or open attached project
2. Import any 3D FBX with animation from the asset store
3. Select FBX in Project window and go to the Animation tab in the Inspector window
4. Scroll down to the curves group and add a curve
5. Edit curve and apply changes
6. Again edit curve and click in Hierarchy window
7. Press cancel in the appeared dialog box
8. Revert changes for FBX from the Inspector

Actual Result:
Curve preview shows the updated/changed curve however on opening curve editor you can still see the older curve

Expected Result:
Curve editor preview should display the older curve

Occurring with:
2019.3.0a8, 2019.2.0b1, 2019.2.0a6

Not Occurring With: 2019.2.0a5, 2019.1.4f1
Note:
Cancel option was not available in 19.1

Environment Used:
Windows 10 and Mac 10.14