Tooltip 在分类字段为数值型字段时，显示不全 #3509

• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

Steps to reproduce

https://codesandbox.io/s/sandiantu-tooltip-wenti-gthc8?file=/index.ts

• close: https://github.com/antvis/G2Plot/issues/2001

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