The select component does not work in automatic word segmentation in multi-select mode

[liushi-code]

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Version

1.7.3

Environment

系统版本win10 20H2,chrome版本91.0，Vue版本2.6.3

Reproduction link

Steps to reproduce

1.使用a-select组件，设置mode为multiple，token-separators为[',',';'] 2.复制字符串'a1,b2,c3'到select框中

What is expected?

期待出现自动分词效果，select框中展示已分词后的选项a1 b2 c3

What is actually happening?

字符串粘贴到select框之后，不能正常显示内容