merge aborts rather than exiting cleanly

[craffel]

I get error: add_cacheinfo failed to refresh for path 'model.pt'; merge aborting. at the end of a merge which otherwise seems to work fine (this is on guava).

$ git init
$ python -c "import torch; torch.save({'a': torch.tensor([1., 2.]), 'b': torch.tensor([3., 4.])}, 'model.pt')"
$ git-theta track model.pt
$ git add model.pt
$ git commit -m "Add model.pt"
$ git checkout -b change
$ python -c "import torch; torch.save({'a': torch.tensor([1., 2.]), 'b': torch.tensor([3., 5.])}, 'model.pt')"
$ git add model.pt
$ git commit -m "Update model.pt"
$ git checkout master
$ python -c "import torch; torch.save({'a': torch.tensor([1., 2.]), 'b': torch.tensor([3., 6.])}, 'model.pt')"
$ git commit -m "Update model"
$ git merge change
Fixing Merge Conflicts in model.pt
b: Both them and us changed this parameter.
Actions:
  avg-all)  average-all: Average our change, their change, and the original parameter together.
   avg-ao)  average-ours-original: Average our change and the original parameter together.
   avg-ab)  average-ours-theirs: Average our change and their change together.
   avg-to)  average-theirs-original: Average their change and the original parameter together.
       to)  take_original: Use the original parameter.
       tt)  take_them: Use their change to the parameter.
       tu)  take_us: Use our change to the parameter.
        q)  quit
𝜃 avg-ab
Auto-merging model.pt
error: add_cacheinfo failed to refresh for path 'model.pt'; merge aborting.
$ python
Python 3.8.10 (default, Nov 14 2022, 12:59:47)
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import torch
>>> torch.load("model.pt")
{'a': tensor([1., 2.]), 'b': tensor([3.0000, 5.5000])}