As we all know, Codeforces has a feature that allows users to hide problem tags for unsolved problems. However, when I create a mashup contest, it shows the tags even for unsolved problems.
It is a very minor issue, but it would be better if the "hide tags for unsolved problems" also includes hiding tags when adding problems to mashup contests. Just imagine being spoiled by the "ternary search", "2-sat", "meet-in-the-middle" tags right away before reading the problems.
When I make mashups for myself, I just don't read the tags.
I have the same issue. It is bad enough that I tried to cover up the tags with my hand whenever I add (unsolved) problems to gym.