InnoDB fails to mark the page status as FREED during freeing of an extent of a segment.
This behaviour affects scrubbing and doesn't write all zeroes in file even though
pages are freed.

        fsp_free_extent(space, page, mtr);

        for (uint32_t i = 0; i < FSP_EXTENT_SIZE; i++) {

                if (!xdes_is_free(descr, i)) {

                        buf_page_free(space, first_page_in_extent + i, mtr,

                                      __FILE__, __LINE__);

                }

        }

Above fsp_free_extent() calls xdes_init() and reinitialize all bitmap of
the extent descriptor page. After that, we rely on bitmap of extent descriptor
page to call buf_page_free()