how to debug hydration?

We're considering switching to GIT/GVFS in a very large project. As we try any operation requiring hydration of many files (build, or just opening a big solution), not just the command but the whole operation system hangs, needing a hard reset to restore operation. The hang we think is windows explorer/filesystem-related, some of the processes stay more or less operable, but we cannot browse files, cannot type, or start new programs.
Hydration of a single file (e.g. opening a text file in the repo) works as expected.

We found out that while this command always works in our repo:
gvfs prefetch --files '*',
this command always hangs:
gvfs prefetch --files '*' --hydrate

I've attached logs of the latter, started in verbose mode. The logs are of 2 separate runs. Please excuse me for the quality, but we weren't able to save the log or do a printscreen with the computer hanging, so the log was photographed. In both cases, the hang was experienced between the last 2 lines, a lot before the last line appeared.

We're willing to try debug the issue, but we're not experienced in debugging filter drivers. If there's any way we could provide more information than this, we'll try to help.

Start by reproducing the hang with gvfs prefetch --files '*' --hydrate and compare it with the working prefetch command. Review the attached verbose logs and the Windows Explorer/filesystem behavior; done means identifying the cause of the system hang or documenting the additional diagnostic evidence needed.