fail to parse %servletContext% in browser in private mode

[Ethan47345]

Describe the bug
the correct site is localhost:7001/xxx/home.html, but in private window(chrome) The first page visit will fail, it turns into localhost:7001/home.html. But the second visit will be successful(In the same private windows not open new private one).

Intuitive reason
Failed to parse configuration. mine is org.owasp.csrfguard.NewTokenLandingPage=%servletContext%/home.html

I suspect it's because the session is null, so go to the this.handleNoSession().

private void doFilter(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain, CsrfGuard csrfGuard) throws IOException, ServletException {
        InterceptRedirectResponse interceptRedirectResponse = new InterceptRedirectResponse(httpServletResponse, httpServletRequest, csrfGuard);
        LogicalSessionExtractor sessionKeyExtractor = csrfGuard.getLogicalSessionExtractor();
        LogicalSession logicalSession = sessionKeyExtractor.extract(httpServletRequest);
        if (logicalSession == null) {
            if (csrfGuard.isUseNewTokenLandingPage()) {
                LogicalSession createdLogicalSession = sessionKeyExtractor.extractOrCreate(httpServletRequest);
                csrfGuard.writeLandingPage(interceptRedirectResponse, createdLogicalSession.getKey());
            } else {
                this.handleNoSession(httpServletRequest, httpServletResponse, interceptRedirectResponse, filterChain, csrfGuard);
            }
        } else {
            this.handleSession(httpServletRequest, interceptRedirectResponse, filterChain, logicalSession, csrfGuard);
        }
    }

Current Solution
I can't hard code NewTokenLandingPage to %servletContext%/xxx/home.html in some reason.
Add a filter before CsrfGuardFilter

@Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        // Force session initialization to ensure that CSRFGuard can get the session correctly.
        httpRequest.getSession(true);
        filterChain.doFilter(request, response);
    }

Is there another way to solve this problem? Adding another filter before CsrfGuardFilter just feels off.