scanimage not working for ET-4850 via wifi

When using scanimage via network for an Epson ET-4850 the command: scanimage -d epson2:net:192.168.188.103 --resolution 150 --mode color -o test-scan.png dies with: scanimage: sane_start: Error during device I/O.

Setting SANE_DEBUG_EPSON2=100 yields a little more information:

...
[17:44:52.219215] [epson2] e2_txrx: eds_recv status, Success
[17:44:52.219227] [epson2] e2_start_ext_scan: fatal error
[17:44:52.219239] [epson2] sane_epson2_start: start failed: Error during device I/O
scanimage: sane_start: Error during device I/O
[17:44:52.219288] [epson2] * sane_epson2_cancel
[17:44:52.219303] [epson2] * sane_epson2_close
[17:44:52.219315] [epson2] close_scanner: fd = 7
[17:44:52.219333] [epson2] sanei_epson_net_unlock
[17:44:52.219346] [epson2] sanei_epson_net_write: cmd = 2101, buf = (nil), buf_size = 0, reply_len = 0
[17:44:52.219362] [epson2] H1[0]: 49 53 21 01
[17:44:52.219433] [epson2] sane_epson2_exit
[17:44:52.219449] [epson2] free_devices

I am on Gentoo with scanimage --version = scanimage (sane-backends) 1.1.1; backend version 1.1.1

Attached the full output.sane_debug.txt