Status: Won't Fix
Fix Version/s: None
Before this commit there was a bug in the reference star selector, which meant it didn't actually retrieve stars over the area specified.
Now that is fixed, having a large value for config.calibrate.astrometry.matcher.maxOffsetPix can cause the matcher to fail to match in situations in which it succeeds when a smaller value is used.
Please note that the commit referenced above is not causing this problem, but is fixing a bug which then allows the fragility of the underlying matching algorithm to be seen.
This is thought to be a general problem; I have seen this on obs_ctio0m9 data, and Chris Morrison [X] has seen this on DECam data.