[Bug Report] el-table current-row-key can't highlight children

[HenryTSZ]

Element UI version

2.13.0

OS/Browsers version

macOS 10.15.3 / chrome 80.0.3987.149

Vue version

2.6.10

Reproduction Link

https://codepen.io/henrytsz/pen/OJVrQWM?editable=true

Steps to reproduce

the first table current-row-key is parentId, can highlight, the second table current-row-key is childId, can't highlight

What is Expected?

the childId can highlight

What is actually happening?

the childId can't highlight

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.