@exampleindent macro does not seem to have effect

Summary: Using @exampleindent does not change indent of @example blocks for 
"plain text" and Info output

Mininum Working Example
------ example.texinfo -------
\input texinfo

@paragraphindent 0
@exampleindent 2

Ruler in chars@*
123456789
@example
EXAMPLE INDENT
@end example
123456789

@bye
-------------------------------

File also attached as example.texinfo.

Steps to Reproduce:
1) makeinfo --plaintext example.texinfo

Output:
---------------------
Ruler in chars
123456789
      EXAMPLE INDENT
123456789
---------------------

Comments: The indent used for @example blocks is 5 spaces which is the 
default listed in the Texinfo manual, but not the value I specified.  I 
tried creating Info format output and the result was also 5 spaces.

Versions:
texinfo : 6.8-4build1 (additional test done with 7.2)
O/S : Kubuntu 22.04.5
HW : Linux tesseract 6.8.0-87-generic #88~22.04.1-Ubuntu SMP 
PREEMPT_DYNAMIC Tue Oct 14 14:03:14 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

Thanks for reviewing,
[email protected]

\input texinfo

@paragraphindent 0
@exampleindent 2

Ruler in chars@*
123456789
@example
EXAMPLE INDENT
@end example
123456789

@bye