I'm having the same issue
Program received signal SIGSEGV, Segmentation fault.
0x0000000000480665 in clif_bossmapinfo (sd=sd@entry=0x4be9350, md=0x0, flag=flag@entry=BOSS_INFO_ALIVE_WITHMSG) at clif.cpp:16864
16864 WFIFOL(fd,3) = md->bl.x;
Missing separate debuginfos, use: debuginfo-install glibc-2.17-323.el7_9.x86_64 keyutils-libs-1.5.8-3.el7.x86_64 krb5-libs-1.15.1-50.el7.x86_64 libcom_err-1.42.9-19.el7.x86_64 libgcc-4.8.5-44.el7.x86_64 libselinux-2.5-15.el7.x86_64 libstdc++-4.8.5-44.el7.x86_64 mariadb-libs-5.5.68-1.el7.x86_64 openssl-libs-1.0.2k-21.el7_9.x86_64 pcre-8.32-17.el7.x86_64 zlib-1.2.7-19.el7_9.x86_64
After a player use convex mirror the server crashed. When the player join the server the server crash.
Any update?