Maybe I'm missing something, but what was the reason for filing #909352 as serious? Looking at #892016 it does not seem like it was the cause of the segfault? Or was it?
If not, then getting rid of squeak-plugins-scratch sounds more like a wishlist cleanup request to me than a serious bug. All the more that removing squeak-plugins-scratch from testing will cause scratch to be removed, which is not a great outcome for those using it. Can you please provide a rationale or downgrade the severity? Marcin