tamte

so in your case the pivot intrinsic is 0 for every prim, so that's not an issue, however keep it in mind in case you encounter the actual pivot mismatch (you'll also need to uncheck Ignore pivot attrib on RS Object properties to use v@pivot)

however your issue seems to be the mismatch of point numbers and prim numbers which RS seems to have problems with
so just append Sort SOP and set Point Sort to By Vertex Order

if you already have them aligned as flat planes
you can use Ray SOP in Min distance mode to store Prim Num Attribute and Prim UVW Attribute to quad version from tri
then use Attrib Interpolate SOP to get the P from world space tri version using those attributes

it shouldn't matter how complicated your setup is, in my experiance it's only that RS doesn't care about intrinsic pivot, but can use v@pivot attribute instead

can you post a file with for example one of your final packed prims stashed ?