Dark mode doesn't work in old ui illustration page

[nobSEIFO]

Acknowledgements / 确认事项

• I have updated to the latest version of the app / 已经更新到最新版
• I have tried the FAQ / 试过FAQ了. FAQ
• I have searched the existing issues and this is new ticket NOT a duplicate or related to another issue / 搜索过其他issue，确实不是重复问题
• I will fill out the title and the information in this template / 填好标题和内容

Shaft app version

4.1.1

Android system version

Android 8

Device model

Samsung s7

Network information (if necessary) / 如果需要（无法看图之类），请提交网络信息

• Can directly access to pixiv website / 可直接访问网页版pixiv
• Use proxy / 使用了代理
• Settings-Direct open enabled / 开启直连
• Settings-Use pixivcat enabled / 开启使用pixivcat代理

Steps to reproduce / 复现步骤

Open the app
Click on a photo

Expected behavior / 期望行为

It should be in the old ui look and in a dark mode (enabled in settings)

Actual behavior / 实际行为

The photo opening with the old ui day mode(light).

Other details / 其它细节

The dark mode only work in the new ui
In the dark mode the old ui illustration page appears gray

Only v 4.1.1 and above have the problem