Honestly, if you can't fix the ability, rework it.

What I'm referring to specifically is Talon's E, Assassin's Path. The ability description reads as follows: "ACTIVE: Talon dashes a maximum of 800 units over the target structure or piece of terrain, with the dash's speed based on his own movement speed." What this description fails to mention is that he will occasionally fail to jump over a wall, even if it's way lower than 800 units.

This has been a bug on Talon probably since his rework came out, and there's been no fix. Although I must give Riot some credit, they did address the problem. @RiotRepertoir stated " I'm not sure about the nature of his E issues, though I know it uses unique tech, so I'd bet it's a difficult issue. I talked to Talon's designer about some of this stuff...". Basically he's saying "We don't know what's going on but we'll try to look at it... eventually."

Somewhere else I saw (Unfortunately I can't find the source) a Riot member state that fixing Talon's E would require a rework to the fundamental coding for pathing in the game, which would be extremely time-consuming and difficult to fix for just one ability so they decided it wasn't worth it. I think it's completely understandable that Riot would make this decision. But now to my main point of this post:

If you can't fix an ability, change the ability into something that functions as intended.

Riot won't change Talon's E, despite it not working right a lot of the time and admitting that they can't fix it. I think it shows their weakness as a company when they just give up on something because they can't make it work. Talon's E is the only situation I'm aware of with this happening, but I have little doubt in my mind that this happens with multiple other abilities in the game.

I know this post was kind of all over the place, but I just needed to get this off my chest. If you want a TL;DR, look at the title/bolded text above.

EDIT: And if you want an example of this bug happening, https://youtu.be/G1WCXQU6nng?t=20