[BUG] A module on the edge of wall is sink

[kazogihara]

Hi!
I found a module on the edge of wall is sink in.
This will occur only on the wall in the photo where the module is sink in.
Just an apparent issue, but odd, so could you check it?

• config.xml

<?xml version="1.0" standalone="no" ?>
<world gridSize="10,10,10" windowSize="1848,1016">
    <camera target="54.5554,56.3875,22.0596" directionSpherical="-2561.64,33.8501,220" angle="45.000000" near="0.100000" far="2000.000000" />
    <spotlight target="0,0,0" directionSpherical="135,80,800" angle="51" />
    <blockList blockSize="10,10,10">
        <block position="9,5,1" color="255,140,0" orientation="0" />
        <block position="9,4,1" color="255,140,0" orientation="0" />
        <block position="0,9,1" color="255,140,0" orientation="0" />
        <block position="1,9,1" color="255,140,0" orientation="0" />
        <block position="1,5,9" color="255,140,0" orientation="0" />
        <block position="1,4,9" color="255,140,0" orientation="0" />
    </blockList>
</world>