This seems to be intentional behaviour by cron.

It checks if /etc/crontab is either group- or other- writeable, and if
so, skips the file.  The comment in the source is:             /* Check
to make sure that the crontab is writable only by root */

from database.c, line 429:
            /* Check to make sure that the crontab is writable only by root */
            if ((statbuf->st_mode & S_IWGRP) || (statbuf->st_mode & S_IWOTH))  {
                log_it(fname, getpid(), "WRONG INODE INFO", tabname);
        goto next_crontab;

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https://bugs.launchpad.net/bugs/741979

Title:
  cron ignores group-writable crontab, with obscure message

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