Redstone torches dropping off still

Mass redstone torches randomly falling off sides of blocks if I exit the world and reopen it, doesn't do it all the time but when it does it... it does it with style.

I assumed it was only happening on chunk edges but this last massive redstone project has proven otherwise, this has been happening since way back when redstone arrived. I have tried to reproduce it but failed.
over 200 torches have fallen off this time