Generative credits disappear

I’m using the Firefly workspace in Photoshop 27.6 for generating since there is the possibility to generate 4k images. This works most of the time. Now I have the problem that the generating takes forever and nothing happens. But the credits are gone of course… 

This should never ever happen. Credits shouldn’t be charged at the beginning of generating but when generating is finished. Just because of problems like this or you want to abort because of fixing the prompt. It is really annoying getting credits charged for nothing.