[BUG] USB drive or file error - MK4 5.1.0-alpha2

[wgentine]

Please, before you create a new bug report, please make sure you searched in open and closed issues and couldn't find anything that matches.

Printer type - [MK4]

Printer firmware version - [5.1.0-alpha2]

Original or Custom firmware - [Original]

USB drive or USB/Octoprint USB Drive+PrusaLink

Describe the bug During the print with prusaslicer 2.7.1 alpha, printer stopped mid print saying: USB drive or file error, the print is now paused. Reconnect the drive. However the USB drive is there and nothing has changed. May be something related to the new binary g-code/streaming.