Scan in lineart mode with JPEG compression off fails

[Andrew Rembrandt]

Hplip: 3.22.10
Sane: 1.1.1
Gscan2pdf: 2.13.0
Distribution: Arch linux (x86 64)
Kernel: 6.1.1
Printer: LaserJet Pro MFP M225DW
Printer Firmware Datecode: 20200619

Fix/same bug reported quite a few years ago (I suspect it was treated as a rare bug that only occurs with specific hardware or old versions, but is in fact a bug that affects most users):
https://answers.launchpad.net/hplip/+question/146735
https://bugs.launchpad.net/hplip/+bug/620088

When scanning over the network and setting lineart mode, with JPEG compression off, the scan is physically carried out, but no image data is ever processed (gscan2pdf hangs waiting for the image data).

Let me know if I should create a bugfix, many thanks!