[Bug-ddrescue] Rescued size got bigger after restarting ddrescue

[Daniel Magrin dos Santos]

Hi all!

I've a failing 320GB Western Digital drive, and I decided to try to
backup it using ddrescue.
So I invoked the program using "ddrescue -n /dev/sdb image log".
When it was displaying ~300GB rescued and ~130MB errsize, I decided to
stop it because it was going to rain and I needed to leave home a
little.
When I came back I typed "ddrescue -n /dev/sdb image log" to restart
it, but then I saw it was displaying 320GB rescued and "Trimming
failed blocks".
I checked the image file and it was around ~300GB as expected. Did I
do something wrong or is this a bug? What should I do to get it
rescuing back from ~300GB?
Do I need to start it from beginning again? Version is 1.11, from Ubuntu repo.

Thanks very much for the attention!