[Fix]: reset key state on type switch when duplicates is last

[anasdevv]

Fixes #514

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.62%. Comparing base (e8b3238) to head (1239aa2).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/parse.js	80.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #536      +/-   ##
==========================================
- Coverage   99.89%   99.62%   -0.27%     
==========================================
  Files           9        9              
  Lines        1853     1877      +24     
  Branches      216      225       +9     
==========================================
+ Hits         1851     1870      +19     
- Misses          2        7       +5     

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[ljharb]

This needs regression tests.