If it was the case the customer support simply knows an undocumented work-around that they can solve the problem and provide that to the customer. I mean that works, but a better solution is for that problem to get back to engineering and be fixed once and for all.
Yes, fully agree. Like I said: solving a customers problem is top priority but regardless of the solution it should be documented and shared. At minimum it can give pm and engineers insights into common issues and potential improvements.