Bug 509805

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SUMMARY
The "forward" functionality to preview media faster does not work as intended with speed 1.5x specifically.
When set to 1.5x it displays the video at 1x. All other speeds like 2x, 3x, 5.5x work as intended.

STEPS TO REPRODUCE
1. Import a video clip, click on it in the media bin to have it displayed in the viewer.
2. Click the "forward" button to set the speed to 1.5x
3. 

OBSERVED RESULT
The playback still runs at 1x speed.

EXPECTED RESULT
The playback should run at 1.5x speed.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

debug info:

Kdenlive: 25.08.0
Package Type: Flatpak
MLT: 7.33.0
Qt: 6.9.2 (built against 6.9.0 x86_64-little_endian-lp64)
Frameworks: 6.17.0
System: KDE Flatpak runtime
Kernel: linux 6.8.0-71-generic
CPU: x86_64
Windowing System: xcb
GPU: Intel/Mesa Intel(R) UHD Graphics 630 (CFL GT2)
Movit (GPU): disabled
Track Compositing: qtblend