Dear Jagex,
The Regeneration perks from pacts were promised to regenerate runes, even if that specific rune is not used to cast the spell (e.g. sunfire runes regenerate fire runes, dust runes regenerate air / earth runes, and staves cause rune regeneration regardless of being an infinite rune source).
However, casting a surge spell at the Fountain of Rune does not regenerate runes. I have 110% rune regeneration, and still this fire surge cast does not give me a wrath rune.
This is inconsistent behaviour compared to the Demonic Offering spell still regenerating wrath runes at the Fountain of Rune. None of the information provided about the Regeneration pacts ever specified that, aside from pacts not applying in PvP situations, combat spells being cast at the Fountain of Rune would be the sole exception to having pacts activate.
Please, Jagex, give me and all other players who chose Wildy without another wrath rune source a way to obtain wrath runes. I worked hard to get this clue step (took me 11 elites + 3 steps = ~70 clue steps in total), so I'm very disappointed to not get wrath runes for the effort.
I'll be keeping this clue in my bank just in case you guys manage to fix this bug. Thanks very much!
PS: I've reported this as a bug in-game too, but that didn't seem to make the "known bugfixes" list in the update post listing those.