Agreed, also mixing own libFLAC with Debian’s will cause other compatibility issues with software which depends on the Debian version. Either it is a bug, then there is a good chance thay Debian patches it in all its versions, or it is a feature, then IMO Squeezelite/LMS should not depend on it until it is widely applied. Why was this not an issue with earlier Squeezelite/LMS versions?
EDIT: Or are these OGG radio streams a new thing or have changed somehow?