:bug: fix: 修复有些时候回到底部按钮不展示的问题

[ONLY-yours]

💻 变更类型 | Change Type

• [ ] ✨ feat
• [x] 🐛 fix
• [ ] 💄 style
• [ ] 🔨 chore
• [ ] 📝 docs

🔀 变更说明 | Description of Change

📝 补充信息 | Additional Information

[github-actions[bot]]

🎊 PR Preview f426bc00d05bc5edd4c543f8c72f22946be5eb49 has been successfully built and deployed to https://ant-design-pro-chat-preview-pr-175.surge.sh

🕐 Build time: 52.126s

_{🤖 By surge-preview}