Both on the android app (3.10.5.22004), as on desktop (3.10.5.0), TAF decoding always give some 'undecoded errors'.

Maybe it's a Swiss addition to the TAFs, but there's always an entry like: TX12/1014Z TN06/1106Z TX15/1114Z

Decoded this would mean TX -> Max temperature 12 Celsius, on the 10th of the month around 14:00Z,

and TN is the minimum temperature (in this case 6 degrees around 0600Z), and tomorrow it'll be warmer with 15 degrees.

I'm not sure how useful it it to mention this in the TAF  (and I don't know how many other countries have this), but the "additional items that have not been decoded" message isn't very appealing either