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Persistence usb drive debian not working correctly on bios legacy

I tried installing debian lxqt with persistence partition on usb by selecting persistence partition on rufus (bios and uefi mode) and also from this thread link, but i end up getting the same result – on uefi based computers it works all good and the data from persistence drive is correctly loading, but on bios legacy based the debian boots and loads correctly but persistence data isnt loading dirrectly to the main system catalogs, i only can reach it on persistence partition by mounting it and finding the data. How may i fix this?