gjournal blocking hd writes (gpt)

Hello,

when I try to alter the GPT on a drive which contains gjournal journal it 
fails even if kern.geom.debugflags=16.
I have to stop all journals before I can write to that drive.
Afterwards gjournal starts up again automatically in contrast to gmirror for 
example.
I thought gpt uses geom to write to the drive these days in -current, so 
kern.geom.debugflags shouldn't be needed anymore. Is that correct?
Why the problem with gjournal?

Thanks

-Harry