Generated a 16k map and ended up with this for the total prefab count:
<?xml version="1.0" encoding="UTF-8"?>
<prefabs>
<decoration type="model" name="oldwest_graveyard" position="784,114,7184" rotation="2" />
<decoration type="model" name="survivor_site_06" position="776,115,7296" rotation="2" />
<decoration type="model" name="ranger_station1" position="680,120,7392" rotation="3" />
<decoration type="model" name="cabin_07" position="608,122,7464" rotation="0" />
<decoration type="model" name="survivor_site_04" position="464,120,7608" rotation="2" />
<decoration type="model" name="ranger_station1" position="-784,95,7184" rotation="3" />
<decoration type="model" name="cabin_15" position="736,116,7376" rotation="2" />
<decoration type="model" name="survivor_site_07" position="552,118,7232" rotation="2" />
<decoration type="model" name="oldwest_graveyard" position="-696,40,5896" rotation="0" />
<decoration type="model" name="cabin_04" position="-616,41,5887" rotation="2" />
<decoration type="model" name="ranger_station1" position="-480,49,6093" rotation="1" />
<decoration type="model" name="cabin_12" position="-352,36,6226" rotation="0" />
<decoration type="model" name="oldwest_graveyard" position="-384,30,6456" rotation="0" />
<decoration type="model" name="oldwest_graveyard" position="-816,90,7072" rotation="0" />
</prefabs>
On mobile while I'm regenerating another 16k world, same seed to see if it was because I wasn't focused on the world gen screen while it was generating...fingers crossed!