This fault is still happening since Oct 2024. However I found a workaround documented here -->
https://stackoverflow.com/questions/78850472/stm32cubeprogrammer-flash-loader-cannot-be-loaded
In case the link has died, you need to do the following...
Connect STM32CubeProgrammer to your STM32 device and note the "Device ID" listed in the "Target Information" window bottom right of the CubeProgrammer app, e.g. for an STM32F103 this will be 0x410.
cd into your "STM32CubeProgrammer/bin/FlashLoader" folder.
duplicate the file that matches your device ID (e.g. for an STM32F103 the file would be 0x410.stldr)
and then rename the duplicated file "0x".
Then restart STM32CubeProgrammer and it will now work properly.
