Interesting -- at some point Adobe changed the behavior of how it invokes the post-processing commands. I did some more experiments with my own post-processing logging scripts (attached for future reference).
It appears that Export batches up multiple files to pass to the command (which it didn't use to do). On both Windows and Mac, there are maximum lengths of command lines that Cmd.exe and Mac shells will accept -- 8192 on Windows and 1,045,576 on Mac. To avoid exceeding the limit, Export seems to be limiting the command line of each batch to about 1400 characters, so you'll see a variable number of files passed based on their path length.
I assume that Export will do something similar on Mac. But the maximum command line is so much longer (1,045,576) that I didn't have the patience to do an Export with enough files to get close to that maximum. I exported 17,000 JPEGs, and it used a single command line of length about 750K!
I never noticed this change in behavior because I rely on Run Any Command.
[The forum didn't like my script attachments and stripped them -- here are the scripts for future reference:]
Mac "log.sh":
#!/bin/sh
echo $# $* >> ~/Desktop/log.txt
Windows "log.bat":
@ECho off
setlocal enabledelayedexpansion
set argC=0
set line=
for %%x in (%*) do (
Set /A argC+=1
Set line=!line! %%x
)
echo !argC! !line! >> %HOMEDRIVE%%HOMEPATH%\Desktop\log.txt
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