Unexpected Behavior in Bryntum Calendar with `CrudManager` and `hasChanges

[ExtAnimal]

Forum post

This test will show the bug:

t.iit('haschanges event fired with correct data when adding drag-created event', async t => {
        t.mockUrl('crudmanager-haschanges-bug', {
            responseText : JSON.stringify({
                success   : true,
                resources : {
                    rows : [{
                        id         : 1,
                        name       : 'Resource 1',
                        eventColor : 'red'
                    }]
                },
                events : {
                    rows : []
                },
                assignments : {
                    rows : []
                }
            })
        });

        calendar = await getCalendar({
            crudManager : {
                loadUrl  : 'crudmanager-haschanges-bug',
                autoLoad : true,
                autoSync : false
            },
            date   : '2024-01-01T09:00',
            events : []
        });
        const { crudManager } = calendar;

        let changesAccepted = false;

        crudManager.on({
            hasChanges({ source }) {
                const { added } = source.changes.events;

                if (added.length === 1 && added[0].name !== 'First') {
                    t.fail('First added event must be passed');
                }
                else {
                    t.pass('First event passed');
                }
                // clear down changed state
                source.acceptChanges();
                changesAccepted = true;
            },
            once : true
        });

        await t.dragBy({
            source : '.b-dayview-day-detail.b-calendar-cell[data-date="2024-01-01"]',
            delta  : [0, 50]
        });
        await t.waitFor(() => calendar.features.eventEdit._editor?.containsFocus);
        await t.type(null, 'First[ENTER]');

        // Wait for changes to be committed.
        // Listener checks that added contains correct data
        await t.waitFor(() => changesAccepted);

        crudManager.on({
            hasChanges({ source }) {
                const { added } = source.changes.events;

                if (added.length === 1 && added[0].name !== 'Second') {
                    t.fail('Previously added event in change set of second add');
                }
                else {
                    t.pass('Second event passed');
                }
                changesAccepted = true;
            }
        });

        changesAccepted = false;

        await t.dragBy({
            source : '.b-dayview-day-detail.b-calendar-cell[data-date="2024-01-05"]',
            delta  : [0, 50]
        });
        await t.waitFor(() => calendar.features.eventEdit._editor?.containsFocus);
        await t.type(null, 'Second[ENTER]');

        // Wait for changes to be committed
        // Listener checks that added contains correct data
        await t.waitFor(() => changesAccepted);
    });