Array Printing depends on the contents of its elements

[longemen3000]

The default array show method checks for new lines to select if the method to display the elements is the 3-arg show or the 2-arg one:

julia/base/arrayshow.jl

Line 110 in 5835c3b

# If the output contains line breaks, try 2-arg show instead.

The behaviour was introduced in #34387

As mentioned in slack, this is a confusing quirk of the display system. And a posible solution is mentioned here: #34387 (comment), comments are against documenting this behaviour: #54547 (comment)