<p></p>
<blockquote>
<p dir="auto">It sucks when undocumented behaviour breaks and you have to change your code, but that's the faustian bargain you make when you rely on it.</p>
</blockquote>
<p dir="auto">There was no way not to rely on it. And in case of elements multifetch, it was documented: <a href="https://wiki.openstreetmap.org/wiki/API_v0.6#Error_codes_21" rel="nofollow">https://wiki.openstreetmap.org/wiki/API_v0.6#Error_codes_21</a></p>

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