log message (file is busy. Skipping for now.)

For one of the hazel rules, I see the following message regularly if the file is large > 100mb
This message makes sense, as the first rule running is moving the file to this folder, then on this folder a second rule, starts to process it.
However, I had assumed, Hazel would not start to process until the file is fully saved. The first rule action is to save a file onto my mac HD from an external source.
My question is:
Is there a better way to handle this in second rule?
(e.g. somehow tell hazel not to start processing until file is fully saved)
or is the situation more like,
this message adds no overhead and so can essentially be accepted as OK, nothing to worry about.
Thankyou for your help.
hazelworker[1572] File xxx.EXT is busy. Skipping for now.
This message makes sense, as the first rule running is moving the file to this folder, then on this folder a second rule, starts to process it.
However, I had assumed, Hazel would not start to process until the file is fully saved. The first rule action is to save a file onto my mac HD from an external source.
My question is:
Is there a better way to handle this in second rule?
(e.g. somehow tell hazel not to start processing until file is fully saved)
or is the situation more like,
this message adds no overhead and so can essentially be accepted as OK, nothing to worry about.
Thankyou for your help.