Starting with OCP 4.14.36+/4.15.29+/4.16 selinux is blocking systemd-coredump from writing its coredump, see also https://issues.redhat.com/browse/RHEL-39937 and linked bugs

OCP 4.14.36+/4.15.29+/4.16

Install one of the above mentioned versions, kill a process with signal 11 and watch journal and audit logs

journal:
Oct 17 06:59:29 sno.sno-csa.coe.muc.redhat.com systemd-coredump[239192]: Failed to open our mntns: Permission denied

audit log 
type=SYSCALL msg=audit(1729148369.687:156898): arch=c000003e syscall=257 success=no exit=-13 a0=ffffff9c a1=7ffd15bf9c90 a2=80100 a3=0 items=0 ppid=2 pid=239183 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="systemd-coredum" exe="/usr/lib/systemd/systemd-coredump" subj=system_u:system_r:systemd_coredump_t:s0 key=(null)ARCH=x86_64 SYSCALL=openat AUID="unset" UID="root" GID="root" EUID="root" SUID="root" FSUID="root" EGID="root" SGID="root" FSGID="root"

1. Install one of the affected versions, i.e. OCP 4.14.36+/4.15.29+/4.16       2. kill a process with signal 11
3. watch journal/audit log for failed systemd-coredump     

    coredump being blocked

    coredump can be written

 Also have a look at https://issues.redhat.com/browse/ACCELFIX-311 for more details