I have a Canon LiDE 700F flatbed scanner connected via USB to an
USB3.0-port of my machine.

> scanimage -L
device `genesys:libusb:001:006' is a Canon LiDE 700F flatbed scanner
>

My machine runs openSUSE Tumbleweed with

Kernel 5.5.7-1-default
sane-backends 1.0.29-1.1
libsane1 1.0.29-1.1
xsane 0.999-2.10

Using sane-backends 1.0.27. scanning worked fine but last week my machine
received an update to sane-backends 1.0.29 and scanning does not work
any longer.

When i use xsane and do a preview i can see the page being build up but
at the end when the scan-bar has been moved back to its start position
the preview gets deleted and xsane gives an device-I/O-error.

When i use xsane and do a normal scan at the end when the scan-bar has
been moved back to its start position xsane gives an device-I/O-error.

When i use scanimage at the end when the scan-bar has
been moved back to its start position scanimage tries to kill my scanner
(horrible noises come from my scanner) and i have to unplug it in order to
avoid that my scanner gets damaged.

I did

export SANE_DEBUG_GENESYS=255
export SANE_DEBUG_GENESYS_LOW=255
export SANE_DEBUG_GENESYS_GL124=255
export SANE_DEBUG_GENESYS_GL646=255
export SANE_DEBUG_GENESYS_GL841=255
export SANE_DEBUG_GENESYS_GL843=255
export SANE_DEBUG_GENESYS_GL847=255
export SANE_DEBUG_SANEI_USB=128

and then

scanimage -T 2>sane_T.log

it produced the files

15278    gl_pipeline_1_0_before_swap.pnm
15278    gl_pipeline_1_1_after_swap.pnm
15278    gl_pipeline_1_2_after_shift.pnm
15278    gl_pipeline_1_3_after_stagger.pnm
1241280  sane_T.log

Then i did

scanimage --clear-calibration --preview --mode Color 1>calibrate.pnm
2>sane_P.log 3>sane_P_err.log

it produced the files

       0  sane_P_err.log
41493738  sane_P.log
 1671443  calibrate.pnm
   31144  gl847_led_00.pnm
   31144  gl847_led_01.pnm
   31144  gl847_led_02.pnm
   31144  gl847_led_03.pnm
   31144  gl_black__average.pnm
 2178977  gl_black__shading.pnm
 1673332  gl_pipeline_6_0_before_swap.pnm
 1673332  gl_pipeline_6_1_after_swap.pnm
 1673331  gl_pipeline_6_2_after_shift.pnm
 1673331  gl_pipeline_6_3_after_stagger.pnm
   31144  gl_white__average.pnm
 2178977  gl_white__shading.pnm

The files sane_T.log and sane_P.log are obviously too large to be attached here
but i can provide them if necessary (or search them if told what to search
for).