While building my terrain network, I suddenly started having export issue's. I'd been exporting 16k heightfields with no issue, but now my export would just stop during the Compute cycle (after 30 minutes no progress)
I did some trouble shooting, and found that the issue was with a Scale&Offset node I had added. If I removed that node from my chain, export worked fine.
The specific issue seems to be using the Scale&Offset node with an input terrain 16K or higher, and with the "Relative to minimum height" scale option checked (regardless if I'm actually changing the scale from 1.0). If I use a terrain below 16K or if I use the "Relative to Zero" scale option, everything exports correctly.
Luckily I can use the "Relative to Zero" since I'm not actually scaling my terrain, so I can still move forward with full terrain resolution.