Installation to USB stick fails

My goal is to install ReactOS to USB stick and make some tests with it on real hardware.
I'm not sure if it will work, since I can boot on real hardware only using Plop Boot Manager.
But nevertheless, I decided to give it a try.
To do this I chose simpler task: install ReactOS to (real) USB stick with the help of VirtualBox.
And this task failed in various ways.

The first problem I saw is hanging while copying files at ~5%.
This problem is reproducing fairly good.
Second problem appeared when I tried to log what is happening to a file.
With logging enabled, installation hangs earlier: at formatting step.
Third problem is a hang too, it happens while preparing the list of files without logging enabled. I think it is not worth chasing now.

What do you think is the next step in trying to make it work?

Test info:
VirtualBox 6.1.12 r139181
reactos-bootcd-0.4.15-dev-3343-g06fc9c4-x86-gcc-lin-dbg.iso
Alcor Micro USB 2.0 Card Reader: USB\VID_058F&PID_6335&REV_0102