Ok. Did a test. 2 strips of cover one for Zook(2) one for piat (2), each strip contains Scattered trees, woods and pines. 100m away are the 4 Panthers, 2 in front of each strip.
In all folliage types the result was the same. Zooks fired and were seen most of the time immediately. Piats remained hidden.
buttoned or not result still the same, Zooks reveal themselves, piats remain quietly hidden.
PS the strips were 2 squares deep and the allies where in the centre of the strip.
Pud