Clarification on Runegraft of Refraction bug fix?

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Fixed a bug where the Locus Mine Support and Runegraft of Refraction did not correctly interact with Kinetic Blast of Clustering's number of explosions, nor Spectral Helix's number of bounces.

I've been trying to understand how exactly the interaction has been changed but the wording is too confusing and ambiguous.

I'm trying to adjust my league starter build according to this fix but I'm not sure what exactly I'm trying to fix. Some clarification would be greatly appreciated!