A1 mini stuck on flow calibration with TPU

Hello,

I noticed that only when printing TPU with the A1 mini it will get stuck on flow calibration and extrude filament endlessly. This will continue even if the print is canceled and the only way to fix is by shutting off machine entirely. Bypassing the calibration allows the print to “print” however no filament is extruded during the process. Is this a known issue?