VPN via port 443 not working with AdGuard enabled

### Please answer the following questions for yourself before submitting an issue.

- [X] I am running the latest version
- [X] I checked the documentation and found no answer
- [X] I checked to make sure that this issue has not already been filed

### AdGuard version

4.3.194

### Environment

```markdown
- OS:Android 14 December 2024 build
- Device:Pixel 8 Pro
- Firmware: December 2024 build
```

### Root access

- [X] Yes, I have it.

### What filters do you have enabled?

AdGuard Base filter, AdGuard Mobile Ads filter, AdGuard German filter, AdGuard Tracking Protection filter, AdGuard URL Tracking filter, AdGuard Social Media filter, AdGuard Annoyances filter, AdGuard Cookie Notices filter, AdGuard Popups filter, AdGuard Mobile App Banners filter, AdGuard Widgets filter, AdGuard Other Annoyances filter, AdGuard DNS filter, EasyList, EasyList Germany, EasyPrivacy

### What Stealth Mode options do you have enabled?

Send Do-Not-Track signals, Strip URLs of tracking parameters, Self-destruction of third-party cookies, Remove X-client-Data header from HTTP request

### Issue Details

Steps to reproduce:
1. Enable AdGuard
2. Try to connect to a VPN server via port 443 (e.g. OpenVPN)

### Expected Behavior

Should be able to connect to the VPN.

### Actual Behavior

Cannot connect to the VPN unless I disable AdGuard.

### Screenshots

Screenshot 1:

### Additional Information

_No response_