The cause is the verbose output of less -V.
So, I fixed with
diff /usr/bin/xzless /tmp/xzless
49c49
< if test "$(less -V | { read ver && echo ${ver#less }; })" -ge 429; then
---
> if test "$(less -V | awk '{if (NR ==1) print $2}')" -ge 429; then
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https://bugs.launchpad.net/bugs/1248044
Title:
xzless report an error
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