[Bug]: can't add any environment variable (the button isn't here)

[DaRandomCube]

Describe the bug

in the past, i used to be able to add variables using a button in the textbox after i write the variable
now i can't

To Reproduce

1. open bottle settings
2. search for environment variables
3. try to add it
4. you can't

Package

Flatpak from Flathub

Distribution

ubuntu 24.04 (wsl, but also happened on someone's else machine)

Debugging Information

Official Package: true
Version: '51.20'
DE/WM: null
Display:
    X.org: true
    X.org (port): :0
    Wayland: true
Graphics:
    vendors: {}
    prime:
        integrated: null
        discrete: null
Kernel:
    Type: Linux
    Version: 6.6.75.1-microsoft-standard-WSL2+
Disk:
    Total: 3106439168
    Free: 3106275328
RAM:
    MemTotal: 5.8GiB
    MemAvailable: 4.5GiB
Bottles_envs: null

Troubleshooting Logs

Additional context

No response

[ndiruhniu]

Just add =1 to your variable. It will be DXVK_ASYNC=1, and then the button will appear.

[DaRandomCube]

I didn't like the change
Maybe you should've added a hint on the new way of adding variables

[ndiruhniu]

I am not the developer of this program. This change was added in version 51.18, and in my opinion, it's not difficult to understand.
Changes in 51.18.
Pull request with this change #3679.