Fix Python parser when chunk separators align (#8720)

[Dreamsorcerer]

(cherry picked from commit 6d3d1fc)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.69%. Comparing base (5ef8cba) to head (ac4f65a).
Report is 222 commits behind head on 3.10.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #8722   +/-   ##
=======================================
  Coverage   97.69%   97.69%           
=======================================
  Files         108      108           
  Lines       34080    34088    +8     
  Branches     4056     4057    +1     
=======================================
+ Hits        33293    33301    +8     
  Misses        587      587           
  Partials      200      200           

Flag	Coverage Δ
CI-GHA	97.58% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.26% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.79% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.93% <100.00%> (-0.01%)	⬇️
Py-3.10.11	97.03% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	96.97% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.21% <100.00%> (+<0.01%)	⬆️
Py-3.12.4	97.30% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.40% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.76% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.91% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	96.86% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.45% <100.00%> (+<0.01%)	⬆️
VM-macos	96.93% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.26% <100.00%> (+<0.01%)	⬆️
VM-windows	94.79% <100.00%> (+<0.01%)	⬆️

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