The file system cache contains stale data so the user is presented with outdated content of a file

Issue

Multi instance MQ hosts with shared NFS share, files are not in sync.

Host details: Multi-instance IBM MQ with 2 RHEL8.3 hosts.
These 2 hosts are having NFS shares (/mnt/qmgr/QM1/ and /mnt/log/QM1/) shared between them. So file /mnt/qmgr/QM1/standby is a shared file.

On node 1, when running:

cat /mnt/qmgr/QM1/standby

the content shows host name host1.

However on node 2, when running:

cat /mnt/qmgr/QM1/standby

the content shows host name host2
The contents are not in sync.
The file system cache contains stale data so the user is presented with outdated content of a file.