text wrap on mtext labels in block unwraps

I've noticed that when I paste blocks with mtext labels in them into drawings where the block definition already exists I lose the text wrap setting.  This results in blocks with labels that are all on one line, sometimes sticking outside the original bounds of the block.

1. First time block was pasted.  Text wrap behaved normally.

2. Went back to source drawing, cleared the clipboard, copied same block again and pasted it a second time.  Text wrap is lost.

I've only recently begun working with mtext labels in blocks so I don't know if this is a common occurance or a recent development following an update.  Whatever the case it's annoying and is interfering with my productivity.