It seems there is an upper limit to how many objects can be graphed:

Encountered this issue on a rather larger application with deeply nested dependencies.
Cannot enlarge memory arrays. Either
// (1) compile with -s TOTAL_MEMORY=X with X higher than the current value 16777216,
// (2) compile with -s ALLOW_MEMORY_GROWTH=1 which allows increasing the size at runtime but prevents some optimizations,
// (3) set Module.TOTAL_MEMORY to a higher value before the program runs, or
// (4) if you want malloc to return NULL (0) instead of this abort, compile with -s ABORTING_MALLOC=0