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    <head>
      <base href="https://bugzilla.netfilter.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Parse error for importing set with netmask"
   href="https://bugzilla.netfilter.org/show_bug.cgi?id=1330">1330</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Parse error for importing set with netmask
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>nftables
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>major
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P5
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>nft
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>pablo@netfilter.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>email@cs-ware.de
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Create the following rules:

# nft add table inet filter
# nft add set inet filter blocklistssh4_8 { type ipv4_addr\; }
# nft add element inet filter blocklistssh4_8 { 1.1.1.1 }
# nft add chain inet filter blocklistssh
# nft add inet filter blocklistssh ip saddr \& 255.0.0.0 @blocklistssh4_8
counter drop

Pipe into file:
# nft list ruleset > rules.nftables

Flush ruleset:
# nft flush ruleset

Try to reimport rules:
# nft -f rules.nftables
rules.nftables:8:26-43: Error: Set 'blocklistssh4_8/8' does not exist
                ip saddr @blocklistssh4_8/8 counter packets 0 bytes 0 drop
                        ^^^^^^^^^^^^^^^^^^

Context:
# nft --version
nftables v0.9.0 (Fearless Fosdick)

# cat /proc/version
Linux version 4.9.0-8-amd64 (<a href="mailto:debian-kernel@lists.debian.org">debian-kernel@lists.debian.org</a>) (gcc version 6.3.0
20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.144-3.1 (2019-02-19)</pre>
        </div>
      </p>
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