[BUG] Variant change in animation does not work when “Use storage for animation” is enabled

[ChenCMD]

Describe the bug
SSIA

To Reproduce
Steps to reproduce the behavior:

1. Enable “Use Storage for Animation”
2. Create at least one animation with variant changes
3. Export (any version)
4. Create the animation created in 2.

Expected behavior
Variants will be changed.

Desktop (please complete the following information):

• OS: Windows_NT x64 10.0.19045
• Version v1.6.0