Are you able to post a picture of the offending block?
I just had an idea - if one could modify the design by adding several pieces to the block to make it look intentional?
I'm thinking that if one piece of that fabric frayed so badly that it pulled out, that more than one might be vulnerable.
I have long thought that to put an "intentional" "mistake" in a quilt is a very arrogant thing to do! I have seen pictures of some of those "mistakes" - and do wonder "What were they thinking?"