Click with right mouse button on the scroll bar and see that content is scrolled.

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.input.ContextMenuEvent;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class BugTableViewRightClick extends Application {

    TableView<Person> testedControl;

    @Override
    public void start(Stage stage) {

        testedControl = new TableView<>();
        
        TableColumn tableColumnA = new TableColumn("First name");
        tableColumnA.setCellValueFactory(new PropertyValueFactory<Person,String>("firstName"));
        TableColumn tableColumnB = new TableColumn("Last name");
        tableColumnB.setCellValueFactory(new PropertyValueFactory<Person,String>("lastName"));
        
        testedControl.getColumns().addAll(tableColumnA, tableColumnB);
        
        ObservableList<Person> data = FXCollections.observableArrayList(
            new Person("Jacob", "Smith", "jacob.smith@example.com"),
            new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
            new Person("Ethan", "Williams", "ethan.williams@example.com"),
            new Person("Emma", "Jones", "emma.jones@example.com"),
            new Person("Michael", "Brown", "michael.brown@example.com")
        );
        testedControl.setItems(data);
        
        testedControl.setMaxHeight(120d);
        testedControl.setPrefHeight(120d);
        
        final ContextMenu contextMenu = new ContextMenu();
        for (int i = 0; i < 3; i++) {
            contextMenu.getItems().add(new MenuItem("Menu item - " + i));
        }

        testedControl.setOnContextMenuRequested(new EventHandler<ContextMenuEvent>() {
            @Override
            public void handle(ContextMenuEvent t) {
                contextMenu.show(testedControl, t.getScreenX(), t.getScreenY());
            }
        });

        HBox root = new HBox(20d);
        root.getChildren().add(testedControl);

        Scene scene = new Scene(root, 300, 250);

        stage.setScene(scene);
        stage.setTitle(System.getProperty("java.runtime.version") + "; " + System.getProperty("javafx.runtime.version"));
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }

    public static class Person {
        private final SimpleStringProperty firstName;
        private final SimpleStringProperty lastName;
        private final SimpleStringProperty email;

        private Person(String fName, String lName, String email) {
            this.firstName = new SimpleStringProperty(fName);
            this.lastName = new SimpleStringProperty(lName);
            this.email = new SimpleStringProperty(email);
        }

        public String getFirstName() {
            return firstName.get();
        }

        public void setFirstName(String fName) {
            firstName.set(fName);
        }

        public String getLastName() {
            return lastName.get();
        }

        public void setLastName(String fName) {
            lastName.set(fName);
        }
    }
}