Missing entity while boolean and brep

[GregoryLi0]

code version

BRL-CAD 7.32.4

OS version

win10 & ubuntu 20.04

Description

Missing entity while operating boolean and brep.

Steps to Reproduce the Issue

1. run shell miss_entity.sh:

# miss_entity.sh

BOOLEAN="`basename $0`"

rm -f $BOOLEAN.*

# create two arb8 solids
mged -c $BOOLEAN.g in sph.1 sph 0 0 0  4
mged -c $BOOLEAN.g in sph.2 sph 4 0 0  2
mged -c $BOOLEAN.g in sph.3 sph 0 6 0  4
mged -c $BOOLEAN.g in arb.1 arb8 1 1 -1  1 5 -1  5 5 -1  5 1 -1  1 1 1  1 5 1  5 5 1  5 1 1

mged -c $BOOLEAN.g g union.1 sph.* arb.*
mged -c $BOOLEAN.g brep union.1 brep b.1

# pipe in mged commands for setting up and saving the view to a render script
cat <<EOF | mged -c $BOOLEAN.g
B b.1
ae 100 -65 180
zoom 1.4
saveview $BOOLEAN.rt
EOF

cat <<EOF | mged -c $BOOLEAN.g
B union.1
ae 100 -65 180
zoom 1.4
saveview $BOOLEAN.expect.rt
EOF

# render the view we saved as a 1024x1024 image
./$BOOLEAN.rt -s1024
./$BOOLEAN.expect.rt -s1024

# convert from raw pix image format to png format
pix-png -s1024 < $BOOLEAN.rt.pix > $BOOLEAN.png
pix-png -s1024 < $BOOLEAN.expect.rt.pix > $BOOLEAN.expect.png

# keep the geometry database as miss_entity.g and the rendering as miss_entity.expect.png and miss_entity.png
mv $BOOLEAN.g miss_entity.g
mv $BOOLEAN.png miss_entity.png
mv $BOOLEAN.expect.png miss_entity.expect.png

# clean up after ourselves
rm -f $BOOLEAN.*
rm -f bool*

The geometry database miss_entity.g and the rendering png miss_entity.expect.png and miss_entity.png are generated.

Current Result

The rendering png:

One sph entity is lost and two surfaces of arb8 are lost.

Expected Result