It's like two or three blocks to place, and screenshots have been provided in this topic. Marius' solution is especially easy without affecting much of how the track looks already.
Literally it's like 10 seconds to fix it and move on to working on your stage 5 part. I really don't see the big deal.
We all wish these cuts hadn't crept up on us. But they have. We have to address it and move on.
It's better for the participants to fix it than the judges or host. You guys are the ones building this track, not us. And who would fix the cuts if you tried to get the original authors to do it? The cuts are between different author's parts. So whose job would it be to fix the cut? It's possible to fix the cut at various points along the track, not all of which are in the same author's part.
It's better for stage 5 participants to ensure there are no cuts up through their part (as long as you don't affect the driving route of previous sections of course). You're all building this thing together!
I certainly understand the time constraints though.
Hopefully stage 6 will go a bit smoother.
Disclaimer: I'm commenting here as a concerned player... not as any kind of authority in this BASCO.