FOR EACH bug - one iteration breaks another

BrightScript Debugger> for each col in a: ? [a[0],a[1]]:end for
red
blue

red
blue

BrightScript Debugger> for each col in a: ? a:end for          
red
blue

"Komag" wrote:
I was diagnosing a game bug and came across this behavior, which seems like a bug to me.

BrightScript Debugger> a = ["red", "blue"]
BrightScript Debugger> ? a
red
blue

BrightScript Debugger> for each col in a: ? "color " col: end for
color red
color blue
BrightScript Debugger> for each col in a: ? "color " col: ? "test " a: end for
color red
test red
blue

BrightScript Debugger> 

The FOR EACH loop breaks! It never does blue!
Why would printing a break the larger loop? Why does iterating through a to print it break the overall iteration of a for the FOR EACH loop? Is that a bug or is that common/known behavior across many programming languages?

Function Main()
	a=["red","blue"]
	for each col in a
		print "color " col
	end for
	for each col in a
		print "color" col
	end for
	for each col in a
		print "test" col
	end for
End Function