<p>A diff between the osm2pgsql stderr output with the first node and without is</p>
<div class="highlight highlight-source-diff"><pre><span class="pl-md">--- without_first_node 2017-04-07 04:23:37.089426226 +0200</span>
<span class="pl-mi1">+++ with_first_node 2017-04-07 04:24:05.425470312 +0200</span>
<span class="pl-mdr">@@ -88,7 +88,7 @@</span>
Reading in file: changes-2391119-reduced.osc
Using XML parser.
parse time: 0s
<span class="pl-md"><span class="pl-md">-</span>Node stats: total(18), max(4780166732) in 0s</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>Node stats: total(17), max(4780166732) in 0s</span>
Way stats: total(1), max(127018391) in 0s
Relation stats: total(0), max(0) in 0s
Maximum node in persistent node cache: 4780168191
<span class="pl-mdr">@@ -171,10 +171,10 @@</span>
Using lua based tag processing pipeline with script wikidata.lua
Going over pending ways...
<span class="pl-md"><span class="pl-md">-</span> 107 ways are pending</span>
<span class="pl-mi1"><span class="pl-mi1">+</span> 73 ways are pending</span>
Using 1 helper-processes
<span class="pl-md"><span class="pl-md">-</span>^MFinished processing 107 ways in 0 s</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>^MFinished processing 73 ways in 0 s</span>
Committing transaction for admin_area
Committing transaction for admin_line
<span class="pl-mdr">@@ -214,10 +214,10 @@</span>
Committing transaction for wikidata_polygon
Going over pending relations...
<span class="pl-md"><span class="pl-md">-</span> 134 relations are pending</span>
<span class="pl-mi1"><span class="pl-mi1">+</span> 98 relations are pending</span>
Using 1 helper-processes
<span class="pl-md"><span class="pl-md">-</span>^MFinished processing 134 relations in 0 s</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>^MFinished processing 98 relations in 0 s</span>
Committing transaction for admin_area
WARNING: there is no transaction in progress
<span class="pl-mdr">@@ -293,47 +293,47 @@</span>
[diff noise from ordering]
<span class="pl-md"><span class="pl-md">-</span>node cache: stored: 18(100.00%), storage efficiency: 0.22% (dense blocks: 1, sparse nodes: 6), hit rate: 67.86%</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>node cache: stored: 17(100.00%), storage efficiency: 0.21% (dense blocks: 1, sparse nodes: 5), hit rate: 79.12%</span>
<span class="pl-md"><span class="pl-md">-</span>Osm2pgsql took 3s overall</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>Osm2pgsql took 2s overall</span></pre></div>
<p>I find nothing useful there, but I did try forcing sparse or dense caches and nothing changed. I also tried setting their coordinates to be the same.</p>
<p>Looking at the nodes, the first one is a member of a way that is not a member of any relations, the second one is a member of a way that is a member of a route relation.</p>
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