I can confirm that this issue was successfully fixed in our latest Version 5.0.1 update. There were several new options added in that release that allow V5 to work correctly with those models. After you update to V5.0.1 make sure to change the following settings:
1) Edit Process Settings > Advanced tab > change Slicing Region Repair Mode to "Alternating Fill"
2) Edit Process Settings > Infill tab > set Solid Infill Threshold Area to zero
After making those 2 changes, the files in this thread all slice correctly for me.
Big thanks to the 3DLabPrint team for working with us to get the issue resolved the the last few weeks! And thank you to everyone else that helped bring the issue to our attention!