WIP: fix weird failing gather

[ctb]

addressing #2825

[codecov]

Codecov Report

Merging #2832 (b517deb) into latest (7e8198b) will decrease coverage by 0.02%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           latest    #2832      +/-   ##
==========================================
- Coverage   86.27%   86.25%   -0.02%     
==========================================
  Files         130      130              
  Lines       14750    14751       +1     
  Branches     2623     2624       +1     
==========================================
- Hits        12725    12724       -1     
- Misses       1724     1725       +1     
- Partials      301      302       +1     

Flag	Coverage Δ
hypothesis-py	25.80% <0.00%> (-0.01%)	⬇️
python	92.84% <33.33%> (-0.02%)	⬇️
rust	50.92% <ø> (ø)

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Files	Coverage Δ
src/sourmash/commands.py	91.48% <100.00%> (ø)
src/sourmash/index/__init__.py	96.33% <0.00%> (-0.38%)	⬇️

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