My observation with rootless back bulbs has been that the higher humidity and warmer, the better they root. I have seen a number make root nubs like that and stall. When I move them to an even warmer and much more humid place, they take off. Your daytime temperatures are just OK on the heat mat.
I now put sick-rooted things into a large hurricane jar or aquarium to keep the humidity up. My growing room is in the upper 80s F / +/-30C by day now, and things are rooting much better than when it was in the upper 70s F / +/-24C.
Also, this may be a hybrid that only roots at a certain time of its growth cycle. But the fact you have root nubs suggests to me it wants to grow if you can give it what it wants.
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