Those models do not support JPEG encoding.
This patch extends original model list proposed in unmerged upstream PR:
https://gitlab.com/sane-project/backends/-/merge_requests/567/diffs

Refer to https://bugzilla.altlinux.org/show_bug.cgi?id=39729
for details

diff --git a/sane-backends/backend/xerox_mfp.c b/sane-backends/backend/xerox_mfp.c
index fc3d94f..148a9f5 100644
--- a/sane-backends/backend/xerox_mfp.c
+++ b/sane-backends/backend/xerox_mfp.c
@@ -215,6 +215,8 @@ static int isSupportedDevice(struct device __sane_unused__ *dev)
 	    !!strstr(dev->sane.model, "CLX-3170") ||
             !!strstr(dev->sane.model, "4x24") ||
             !!strstr(dev->sane.model, "4x28") ||
+			!!strstr(dev->sane.model, "WorkCentre 3220") ||
+			!!strstr(dev->sane.model, "WorkCentre 3225") ||
 	    !strncmp(dev->sane.model, "M288x", 5))
 	    return 0;
         return 1;