Missing block during conversion

[rukiroki]

When I tried to convert the map structure file to a resource pack, I noticed that there were missing squares in the conversion process
This is the source file of the conversion error:
mapdraw.zip
They have extensive holes.
This is a sample picture

[rukiroki]

My guess is that the program mistakenly eliminated all the same squares as the top left square of the structure file, where the gold block marks the left front of the armor stand.