I found the problem. Long story short, when the feed list is too long, it doesn’t work. It’s not the number of feeds, but the total size of the list. In your case, the names are long, so it exceeds the limits. You got lucky removing that on output. The gap must have appeared in a non sensitive portion of the Json.
In the short term, you could reduce the size of the names or wait a few more days and take the next ALPHA release which resolves the issue. I was able to recreate the problem and made some changes to the development release. Your configuration is graphing fine here (ignore the data, it’s meaningless)
I hope to put out 02_02_31 as ALPHA auto-update later this week.