Windows resized to top half screen after removing HDMI

### What Happened?

After removing the HDMI cable for my 2nd monitor (in elementary 7 Horus), every window is resized to the top half screen, even when maximizing them.
Seems to happen when dock is not hidden. This problem does not occur when changing Dock settings to "Hide when: any window overlaps the dock".

**Display info**

I use a Samsung 44" TV as a monitor, but it's detected as 85" (had the same issue in elementary 5)

[StackExchange question](https://elementaryos.stackexchange.com/questions/30197/windows-resized-to-top-half-screen-after-removing-hdmi)

### Steps to Reproduce

This is how it looks after removing the HDMI cable.
Maximized:

### Expected Behavior

Maximized window should occupy the whole screen, not the top half.

### OS Version

7.x (Horus)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

`~$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 39 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Vendor ID: GenuineIntel
Model name: Intel(R) Core(TM) i3-6006U CPU @ 2.00GHz
CPU family: 6
Model: 78
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
Stepping: 3
CPU max MHz: 2000.0000
CPU min MHz: 400.0000
BogoMIPS: 3999.93`