Thanks for the report, we’ll look into this most likely after SpeckleCon is over!
PS
Speckle uses its own viewer, which is designed to work on a wider variety of data types (but relies on some conversion logic that comes form IFC.js for importing IFC files).
Some good news @gjordanp our internal testing on the new IFC parser show that this problem will be fixed. We hope to release the new IFC parser this or next week!