tested with the PR, the 2 service monitors have exactly the same namespace selector and label selector, Observe > Targets page now show the correct service monitor, see the picture.
# oc -n ns1 get servicemonitor
NAME                           AGE
prometheus-example-monitor-1   11m
prometheus-example-monitor-2   10m


# oc -n ns1 get servicemonitor prometheus-example-monitor-1 -o jsonpath="{.spec.namespaceSelector}"; echo -e "\n"; oc -n ns1 get servicemonitor prometheus-example-monitor-1 -o jsonpath="{.spec.selector.matchLabels}"
{"matchNames":["ns1"]}

{"app":"prometheus-example-app"}

# oc -n ns1 get servicemonitor prometheus-example-monitor-2 -o jsonpath="{.spec.namespaceSelector}"; echo -e "\n"; oc -n ns1 get servicemonitor prompath="{.spec.selector.matchLabels}"
{"matchNames":["ns1"]}

{"app":"prometheus-example-app"}

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: OpenShift Container Platform 4.10.3 security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:0056