It really is down to the cap/cork and bottle top. Some mini's have great caps and they are not an issue but in general thes caps on mini's have a lot to be desired.
An educated guess is that the small area that the Mini cap covers is too insufficient to create a good seal for long term storage. Have a good look at the cap and bottle neck of a Mini in comparison to a regular bottle. The thread on the bottle neck of a larger bottle and the cap is much deeper.
However if you look at sample bottles that LFW have these are great for storing whisky.
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