Copying a clip to a new project copies the proxy, and not the original

Hi there!

To get around some corruption in project files, I have taken to the workaround of copying clips from one project to another.

In the past, and until a couple of weeks ago, this worked properly.

Now, though, if you have proxies enabled for a project it is the proxy clips that are copied into the new project, rather than the originals, as intended.

Here is a small video showing the bug in action:

2023-11-11 08-31-41.mp4

This is with Kdenlive pulled from master branch and compiled on 2023-11-09

About my machine:

Operating System: Arch Linux 
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.111.0
Qt Version: 5.15.11
Kernel Version: 6.6.1-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 32 × 13th Gen Intel® Core™ i9-13900HX
Memory: 62.5 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: TUXEDO
Product Name: PD5x_7xSNC_SND_SNE
System Version: Not Applicable