[Bug] gif size error when export gif twice.

[da730]

Version

1.2.4-alpha.5

Link to Minimal Reproduction

null

Steps to Reproduce

see feat/node-support branch.

Current Behavior

gif size error：

Expected Behavior

gif has the same size as jpg:

Environment

- OS:
- Browser:
- Framework:

Any additional comments?

No response

[da730]

与 #111一并修复