Adding here to bump visibility, this is still an issue and extremely annoying. The lack of progress in explaining to the community what the state of the issue is or what is known/not known about it is frustrating considering the post dates of the linked posts in the above.
Can we at least get some idea about the nature of it, and what has been considered so far? I.e. has anyone even looked into it on the plutonium side?
Edit: Clarification