executing script after reset-configuration on ROS 6.3

The option to execute a script fails after the following reset-configuration command has been executed and the routerboard has restarted if the file x.rsc is greater than or equal to 64kb.
Files .LE. about 63.5kb execute successfully.

/system reset-configuration keep-users=yes no-defaults=yes skip-backup=yes run-after-reset=x.rsc

This is true on ROS 6.3 and (i believe) on earlier ROS 6.x versions.

Mikrotik: is this a design decision or could this changed to allow .rsc files of greater size to be executed?

thanks in advance.