One regression in 2.13.11 has been reported, involving Java reflection and Java’s @Deprecated annotation: java.lang.annotation.AnnotationFormatError thrown when checking @Deprecated annotations present on java method through scala class · Issue #12799 · scala/bug · GitHub
Obviously we’ll want to fix it for 2.13.12, but how big a problem is it for 2.13.11? Is it an obscure corner case, or will it be encountered commonly? If you feel you have some insight into how many users are likely to be affected, please comment on the ticket.