Hello Luca and welcome to Advanced Installer forums,
This may be caused by a small modification that we have made in what regards the way we create temporary cleanup files. I have forwarded this to the development team and we will try investigating this soon. Thank you for bringing this to our attention.
I will update this thread as soon as we will find a conclusive answer.
P.s.: please forgive me if I'm in the wrong forum section, actually I was unsure if this is a feature request or a common problem
Do not worry about this. It can be labelled as both.