How to apply filters not only in first but also in continued dialog interactions?

Question

Given following QnA Maker Knowledge Base:

Topic 1 (with meta data: name1 : value1)
 Sub Topic 11 (with no meta data)
 Sub Topic 12 (with meta data: name1 : value1)

and dialog:

class QnAMakerBaseDialog extends QnAMakerDialog {

    constructor(knowledgebaseId, authkey, host, userProfileAccessor) {
        var noAnswer = ActivityFactory.fromObject(DefaultNoAnswer);
        var filters = [{ name: 'name1', value: 'value1' }];
        super(knowledgebaseId, authkey, host, noAnswer, DefaultThreshold, DefaultCardTitle, DefaultCardNoMatchText,
            DefaultTopN, ActivityFactory.cardNoMatchResponse, filters, QNAMAKER_BASE_DIALOG);
        this.id = QNAMAKER_BASE_DIALOG;
        this.userProfileAccessor = userProfileAccessor;
    }

    async beginDialog(DialogContext, object) {
        this.strintFilters = [{ name: 'name1', value: 'value1' }];
        return await super.beginDialog(DialogContext, object);
    }

    async continueDialog(DialogContext) {
        this.strintFilters = [{ name: 'name1', value: 'value1' }];
        return await super.continueDialog(DialogContext);
    }

}

exports.QnAMakerBaseDialog = QnAMakerBaseDialog;

Expected behavior:

Due to an active filter [{ name: 'name1', value: 'value1' }] I would expect "Sub Topic 11" (it has no meta data!) NOT to be in the answers returned by QnA Maker.

Actual behavior:

When querying for "Sub topic 11" in first interaction ("beginDialog"), QnA returns "No answers found" as expected. However, when querying for "Topic 1", QnA Maker returns

• both "Sub Topic 11" and "Sub Topic 12" (ideally "Sub Topic 11" should not be included in answers), and
• when the dialog is continued ("continueDialog") and the user queries for "Sub Topic 11" as well, "Sub Topic 11" is returned as an answer, even that "Sub Topic 11" doesn't has the required meta data.

It seems QnA Maker only applies filters at the first interaction ("beginDialog") but not on subsequent interactions.

Is there any way to apply filters on all QnA Maker queries?