Found this through introspection, only a real problem with -O0.
We were moving a fextl::vector in to a shared pointer so it can be long
living, this causes a change in ownership which was causing the
`BlobData` pointer to be stale. This was then passed to the work queue
to be consumed. In -O1 and above a std::move of a fextl::vector is a
proper move, but -O0 it turns in to a copy.
Easy fix is to just create the shared_ptr early and reference that, so
the pointer is long lived and no references become stale.