PotreeConverter 2.0 Hangs at 99% without error.

[Hutch07]

I have a few files that seem to hang PotreeConverter 2.0 at 99% finished. There is no error but I let them go for about 20 minutes and I do not think they will finish. Other files work fantastic. All are .las files and one is large 11GB and one is only 2GB. I thought it may be when it was combining several las files so I combined them together (the 11 GB file) and the result was the same.

I have also tried -m random same issue.

[100%, 567s], [INDEXING: 99%, duration: 95s, throughput: 7MPs][RAM: 1.4GB (highest 7.7GB), CPU: 6%]

Is there a way to troubleshoot what may be happening here?
UPDATE

WARN(indexer.cpp:885): Encountered unfavourable point distribution. Conversion continues anyway because not many duplicates were encountered. However, issues may arise. If you find an error, please report it at github.
#points in box: 1047325, #unique points in box: 1044380, min: 1416565.0985000001, 14397217.292359374, 7.6989999999999998, max: 1416795.0891406252, 14397447.283, 237.68964062500112<
Was shown while it was running.

[Hutch07]

#438 - It seems like this is similar.