table固定列，数据为空时，表头的阴影不见了

[qq330967496]

• [ ] I'm sure this does not appear in the issue list of the repository

Basic Info

• Package Name And Version: @arco-design/[email protected]
• Framework version: Vue
• Browser: chrome125.0.0.0
• Reproduction Link: https://stackblitz.com/edit/cx9nat?file=src%2FApp.vue