pagedSearchEstimate throws NPE

I have a connector based on REST Connector superclass, configured to use pagedSearchEstimate 

<configuredCapabilities xmlns:cap="http://midpoint.evolveum.com/xml/ns/public/resource/capabilities-3">
    <cap:pagedSearch/>
    <cap:countObjects>
        <cap:simulate>pagedSearchEstimate</cap:simulate>
    </cap:countObjects>
</configuredCapabilities>

However, it doesn't work as expected; when I try to load objects on resource, I'm getting following:

2022-03-21 14:14:27,032 [] [http-nio-8770-exec-10] ERROR (com.evolveum.midpoint.web.component.data.SelectableBeanContainerDataProvider): Couldn't count objects.
java.lang.NullPointerException: null

at com.evolveum.midpoint.provisioning.impl.shadows.SearchHelper.countResourceObjects(SearchHelper.java:500) at com.evolveum.midpoint.provisioning.impl.shadows.SearchHelper.countResourceObjects(SearchHelper.java:500) at com.evolveum.midpoint.provisioning.impl.shadows.SearchHelper.countObjects(SearchHelper.java:478)

...

In the attachment you can find whole stacktrace.