el-table fix属性导致子表展开后父表hover样式错位问题

[rexkny]

求助这个问题该如何解决

前置条件：elment-ui版本2.15.12；vue版本2.7.14
简化代码如下：

datalist: [
{a: '124', b: '1243', c: '213', d: '213', e: '345', f: '124', g: '124', h: '124', children: [
{ subA: '12', subB: '1243', subC: '213' },
{ subA: '13', subB: '1243', subC: '213' },
{ subA: '14', subB: '1243', subC: '213' },
]},
{a: '122', b: '1243', c: '213', d: '213', e: '345', f: '124', g: '124', h: '124', children: [
{ subA: '15', subB: '1243', subC: '213' },
]},
{a: '121', b: '1243', c: '213', d: '213', e: '345', f: '124', g: '124', h: '124'}
]
问题重现步骤：
展开任意子表，将鼠标光标悬浮至父表行上，发现该子表后的父表行悬浮效果错位，错位行数与子表数据行数一致
期望结果：
展开任意子表，将光标悬浮至父表行上，悬浮效果生效行与当前光标所在行保持一致

[rexkny]

html部分似乎并没有格式化成文本，做个补充
<el-table :data="dataList"> <el-table-column align="center" type="expand"> <template v-slot="scope"> <el-table :data="scope.row.children"> <el-table-column align="center" prop="subA" label="subA"></el-table-column> <el-table-column align="center" prop="subB" label="subB"></el-table-column> <el-table-column align="center" prop="subC" label="subC"></el-table-column> </el-table> </template> </el-table-column> <el-table-column align="center" prop="a" label="a"></el-table-column> <el-table-column align="center" prop="b" label="b"></el-table-column> <el-table-column align="center" prop="c" label="c"></el-table-column> <el-table-column align="center" prop="d" label="d"></el-table-column> <el-table-column align="center" prop="e" label="e"></el-table-column> <el-table-column align="center" prop="f" label="f"></el-table-column> <el-table-column align="center" prop="g" label="g"></el-table-column> <el-table-column align="center" prop="h" label="h" fixed="right"></el-table-column> </el-table>