I saw no news about this bug. Everytime someone is hosting skittergate, after entering the portal he will lose every talent for the rest of the mission. No matter which champ you pick, you will lose talents after entering the portal.
I had the same problem! Though I THINK I was not even hosting…
Good they know, was not in the “know issue” list in the last patch notes. Hope they will fix this mission coz for now im just skipping it