<p>I broke out gdb and stepped through to see what IDs output_multi_t::enqueue_ways is called with</p>
<p>When working as expected, they are<br>
127018391<br>
312476311<br>
9223372036854775807 (= 2^63 - 1)</p>
<p>When not working, they are<br>
85486005<br>
127018391<br>
9223372036854775807 (= 2^63 - 1)</p>
<p>The max signed signed bigint is coming from <a href="https://github.com/openstreetmap/osm2pgsql/blob/c3d17f4ca13fbfa036b9b0c033b1c08b16bc6bf4/middle-pgsql.cpp#L588">https://github.com/openstreetmap/osm2pgsql/blob/c3d17f4ca13fbfa036b9b0c033b1c08b16bc6bf4/middle-pgsql.cpp#L588</a>. Both pending lists look correct as passed <em>into</em> the function.</p>
<p>When working as expected with the building the following are calls to job_queue</p>
<p><code>output-multi.cpp:89</code> <code>job_queue.push(pending_job_t(127018391, 0));</code><br>
<code>output-multi.cpp:110</code> <code>job_queue.push(pending_job_t(127018391, 0));</code></p>
<p>And the job_queue is std::stack wrapping: std::deque with 2 elements = {{osm_id = 127018391, output_id = 0}, {osm_id = 127018391, output_id = 0}}. So there's two of the building.</p>
<p>When not working, no job_queue push calls are made with the building.</p>
<p>Looking through the differences between <code>output_pgsql_t::enqueue_ways</code> and <code>output_multi_t::enqueue_ways</code> I see that the last condition is <code>==</code> for multi and <code>></code> for pgsql. Changing that, both job queues have the one occurrence of the building, and the output checks out.</p>

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