In 2011y, Johann was introduce a wire protocol changes.

commit f90abfdc961debae069804307dcbc883b50c137c
Author: Johann Lombardi <johann@whamcloud.com>
Date:   Thu Dec 15 01:00:00 2011 +0100

   LU-169 lov: add generation number to LOV EA

This commit replace an unused field 'stripe_offset' in server reply with layout generation.
so same offset in this structure have a different purpose.
But, author forget about replay case. in this case, LOV EA directly copied from Server reply into client source buffer. Before this change it was LOV_DEFAULT_OFFSET aka -1, but after this change it's replaced with zero for new allocated file.
PFL landing have improve a layout checks for 'SETSTRIPE' requests, so it verified against a pool indexes now.
–
That's all.

Client create a file in directory with pool assigned, but server failed. Client tries a resend open+create call but it have silence failed on replay with EINVAL in lod_verify_v1v3 as '0' isn't part of lod pool indexes.