breakage: Using self-defined Macro in macro definition

[Robert Klein <roklein@roklein.de>]

Hi,

when I use a self-defined macro in a macro definition, subsequent
macros in the same macro definition don't get expanded (tested with
org version 9.2.1 and tip of maint):

--- snip example ---
#+Macro: newline (eval "\n")
#+Macro: new $1 {{{newline}}}#+Index: $1 {{{newline}}}

Use the {{{new(format)}}}
command to format a string according to the
/format-string/ argument.
--- snip example ---


the output of which is:

--- snip resulting output ---
Use the format a 
\index{format {{{newline}}}}
command to format a string according to the
\emph{format-string} argument.
--- snip resulting output ---


The expected output would be:

--- snip expected output ---
Use the format a 
\index{format} 
command to format a string according to the
\emph{format-string} argument.
--- snip expected output ---


PS: leaving the second {{{newline}}} out is not a solution, as
paragraph reformatting will put the macro in the middle of the line.



The issue doesn't crop up, when using a predefined macro, e.g. ` date'
or `author'.


It also doesn't show up, when the first macro in the macro is e.g. the
predefined macro `date'.  That is the following example 2 works ok:

--- snip example 2 ---
#+Date: <2020-01-20 Mon>
#+Macro: old $1 {{{date}}} {{{newline}}} alpha {{{newline}}} beta

{{{old}}}
--- snip example 2 ---


Thanks for any hints/help.

Best regards
Robert