This is not yet fixed for the 5900.
Currently in tribe 3 (and updated further since),
/etc/udev/rules.d/45-libsane.rules still lacks the following info:
# Epson CX-5900
SYSFS{idVendor}=="04b8", SYSFS{idProduct}=="082e", MODE="664", GROUP="scanner"
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Epson CX5900 scanner/printer scanner part not detected
https://bugs.launchpad.net/bugs/72506
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