I must admit my knowledge at the frame level in HEVC is somewhat lacking. So please excuse my ignorance
but in my understanding there are 4 types of I-frames in HEVC:
IDR, CRA, BLA and normal I-frames.. Well thats what Harmonics AV Analyser is saying..
ffprobe´s parse just say capital I and non- capital I.
IDR is the only one that actually enforces a full flush of the decoders buffer, hence beeing used in a ABR ladders cross points.
The main problem here is that Shaka Packager is getting the segment length wrong due to this as it expects an IDR frame at the start of every segment