KDE Plasma 6.5 won't do anything when region passed via CLI

[barsikus007]

Flameshot Version

Flameshot v13.3.0 (-)
Compiled with Qt 6.10.1

Installation Type

Linux, MacOS, or Windows Package manager (apt, pacman, eopkg, choco, brew, ...)

Operating System type and version

NixOS 26.05

Description

I want to use flameshot with slurp (native gui won't show up correctly on 2 monitors, there is issue for that), so I specified region with cli parameter.
Although just flameshot gui is working, flameshot gui --region '...' isn't...

Steps to reproduce

> flameshot gui -g
Unable to get current screen, starting to use primary screen. It may be a cause of logical error and working with a wrong screen.
QLayout: Attempting to add QLayout "" to SidePanelWidget "", which already has a layout
Unable to get current screen, starting to use primary screen. It may be a cause of logical error and working with a wrong screen.
Unable to get current screen, starting to use primary screen. It may be a cause of logical error and working with a wrong screen.
Unable to get current screen, starting to use primary screen. It may be a cause of logical error and working with a wrong screen.
QPainter::begin: Paint device returned engine == 0, type: 2
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setCompositionMode: Painter not active
QPainter::translate: Painter not active
QPainter::setPen: Painter not active
QPainter::setBrush: Painter not active
QPainter::drawEllipse: Painter not active
QPainter::setBrush: Painter not active
QPainter::drawEllipse: Painter not active
Unable to get current screen, starting to use primary screen. It may be a cause of logical error and working with a wrong screen.
312x-260+2126+1545
QThreadStorage: entry 8 destroyed before end of thread 0x55da5de06a20
QThreadStorage: entry 7 destroyed before end of thread 0x55da5de06a20
QThreadStorage: entry 3 destroyed before end of thread 0x55da5de06a20
QThreadStorage: entry 2 destroyed before end of thread 0x55da5de06a20

> flameshot gui --region '312x-260+2126+1545'
QSettings::value: Empty key passed
QSettings::value: Empty key passed
^C

I also specified region in different formats

There is what appeares after any flameshot gui --region '...' command with correct region syntax (like all/screen0 etc)

Screenshots or screen recordings

No response

System Information

> nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.18.7-cachyos-lto, NixOS, 26.05 (Yarara), 26.05.20260120.80e4adb`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.31.3`
 - nixpkgs: `/nix/store/nwl155y14v16b74j1fbc61ryq2dbk5hg-source`

KDE Plasma 6.5 on wayland