Multirow fails to join rows in tabular containing parboxes and figures

Question

I am trying to join the rows of table that contains parboxes and figures, but multirow doesn't seem to work. Could someone please help me? Below is a minimum working example. Thanks, Jorge.

UPDATE1: Note that I really need the extra vertical space above Fig. B (that's why I embed it in a \parbox).

UPDATE2: It seems the real problem is that \tabular or \multirow are unable to properly take into account the height of the tallest cell when it is defined by a \parbox. I have modified my example to show the problem.

NEW MINIMUM WORKING EXAMPLE:

\documentclass{article}
\usepackage{graphbox,graphicx,multirow,multicol,geometry,array}
\begin{document}

This works:\\
\begin{tabular}{|l|l|r@{}|}
    \hline
    blah & blah & \multirow{4}{*}{\fbox{Text}}\\
    \hline
    blah & blah & \\
    \hline
    blah & blah & \\
    \hline
    blah & blah & \\
    \hline
\end{tabular}

\vspace{1cm}
This doesn't work:\\
\begin{tabular}{|l|l|r@{}|}
    \hline
    blah & blah & \multirow{4}{*}{\fbox{\parbox[b][3cm][b]{1cm}{Text}}}\\
    \hline
    blah & blah & \\
    \hline
    blah & blah & \\
    \hline
    blah & blah & \\
    \hline
\end{tabular}

\end{document} 

OUTPUT:

OLD MINIMUM WORKING EXAMPLE:

\documentclass{article}    
\usepackage{graphbox}
\usepackage{graphicx}
\usepackage{multirow}

\begin{document}

% All separate rows
\noindent{}I want to join the rows in the last column of this table (keeping the bottom vertical alignment, so that the bottom of fig. B is now aligned with the "Some other text" line):\\

\begin{tabular}{|l|l|r|}
    \hline
    \parbox[t][][t]{4cm}{Some text}
    & \parbox[t][][t]{4cm}{
            Some text\\
            Some text\\
            Some text\\
            \\
            \includegraphics[width=3cm]{example-image-A}
        }
    &
        % I embed Fig. B in a parbox to create the artificial space above it!
        % (Also, why it's not aligned to the right, as specified in the tabular options?)
        \parbox[t][1cm][b]{5cm}{
        \includegraphics[align=t,width=4cm,height=4cm]{example-image-B}
        }
    \\
    \hline
    \small{Some other text} & &\\
    \hline
\end{tabular}

\vspace{1cm}

% Attempt to join rows in right-most column:
\noindent{}Using \emph{multirow} doesn't seem work:\\

\begin{tabular}{|l|l|r|}
    \hline
    \parbox[t][][t]{4cm}{Some text}
    & \parbox[t][][t]{4cm}{
            Some text\\
            Some text\\
            Some text\\
            \\
            \includegraphics[width=3cm]{example-image-A}
        }
    & \multirow{2}{*}{
        % I embed Fig. B in a parbox to create the artificial space above it!
        % (Also, why it's not aligned to the right, as specified in the tabular options?)
        \parbox[t][1cm][b]{5cm}{
        \includegraphics[align=t,width=4cm,height=4cm]{example-image-B}
        }
    }
    \\
    \hline
    \small{Some other text} & &\\
    \hline
\end{tabular}

\end{document} 

Output:

UPDATE: @Bernard proposed a workaround by tweaking the height of a neighboring cell (see below), which suited my particular need. The original problem (multirow cell height adjustment with \parbox elements) remains unsolved, though.

\documentclass{article}
\usepackage{graphbox}
\usepackage{graphicx}
\usepackage{multirow}
\usepackage{multicol}
\usepackage{geometry}
\usepackage{array}

\begin{document}
\setlength{\extrarowheight}{2pt}
\begin{tabular}{|l|l|r@{}|}
        \hline
        \parbox[t][][t]{4cm}{Some text}
        & \parbox[t][][t]{4cm}{
                Some text\\
                Some text\\
                Some text\\
                \\
                \includegraphics[width=3cm]{example-image-A}\\[1.5cm]
            }
        &
        \\
        \cline{1-2}
        \small{Some other text} & & \multirow{-8.4}{*}{\includegraphics[align=b,width=4cm,height=4cm]{example-image-B}}\\
        \hline
\end{tabular}
\end{document}

OUTPUT:

Answer 1

Here is a simple solution with multirow. You must be aware that the no of rows as an argument for the environment, is actually rather the number of lines, i.e. n = no of rows is valid for one-line cells. Also, the graphics is indeed right aligned, as you can see when the last tabcolsep is deleted.

\documentclass{article}
\usepackage{geometry}
\usepackage{graphbox}
\usepackage{graphicx}
\usepackage{array, multirow}

\begin{document}

\setlength{\extrarowheight}{2pt}
\begin{tabular}{|l|l|r@{}|}
    \hline
    \parbox[t][][t]{4cm}{Some text}
    & \parbox[t][][t]{4cm}{
            Some text\\
            Some text\\
            Some text\\[1.5cm]
           % \\
            \includegraphics[width=3cm]{example-image-A}
        }
    &
    \\
    \cline{1-2}
    \small{Some other text} & & \multirow{-8.4}{*}{\includegraphics[align=b,width=4cm,height=4cm]{example-image-B}}\\
    \hline
\end{tabular}

\end{document}