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@fly
I can confirm that this appears to be fixed in Cura 4.9 beta.

This is a snip-it of infill from cura 4.8. I ran it through Arc welder. 80% concentric infill

;TYPE:FILL G3 X114.491 Y161.707 I-0.437 J-48.369 E0.09073 F3000 G1 X114.491 Y161.708 E0.00003 G3 X112.776 Y161.573 I2.616 J-44.197 E0.04541 G1 X112.776 Y161.574 E0.00003 G3 X111.066 Y161.378 I5.309 J-53.877 E0.04543 G1 X111.066 Y161.379 E0.00003 G3 X108.528 Y160.977 I6.489 J-49.181 E0.06786 G1 X108.528 Y160.978 E0.00003 G1 X107.692 Y160.815 E0.02248 G1 X107.692 Y160.814 E0.00003 G3 X101.451 Y159.114 I9.691 J-47.883 E0.17088 G1 X101.451 Y159.115 E0.00003 G3 X99.830 Y158.525 I16.258 J-47.191 E0.04555 G1 X99.83 Y158.526 E0.00003 G1 X99.434 Y158.371 E0.01122 G1 X99.434 Y158.37 E0.00003 G3 X92.106 Y154.756 I17.921 J-45.575 E0.21591 G1 X92.106 Y154.757 E0.00003 G1 X91.742 Y154.536 E0.01124 G1 X91.742 Y154.535 E0.00003 G3 X78.125 Y142.167 I25.749 J-42.029 E0.48848 G1 X78.124 Y142.168 E0.00004 G3 X75.241 Y137.890 I39.556 J-29.768 E0.13622 G1 X75.242 Y137.89 E0.00003 G3 X69.278 Y122.752 I42.239 J-25.385 E0.43148 G1 X69.279 Y122.752 E0.00003 G3 X69.105 Y121.905 I72.866 J-15.410 E0.02282 G1 X69.106 Y121.905 E0.00003 G3 X68.621 Y118.934 I49.398 J-9.589 E0.07949 G1 X68.622 Y118.934 E0.00003 G3 X68.426 Y117.224 I55.533 J-7.231 E0.04544 G1 X68.427 Y117.224 E0.00003 G3 X68.292 Y115.509 I44.062 J-4.331 E0.04541 G1 X68.293 Y115.509 E0.00003 G3 X68.293 Y109.491 I48.658 J-3.009 E0.15896 G1 X68.292 Y109.491 E0.00003 G3 X68.427 Y107.776 I44.197 J2.616 E0.04541 G1 X68.426 Y107.776 E0.00003 G3 X68.622 Y106.066 I53.877 J5.309 E0.04544 G1 X68.621 Y106.066 E0.00003 G3 X69.021 Y103.533 I49.888 J6.580 E0.06772 G1 X69.02 Y103.533 E0.00003 G3 X70.886 Y96.451 I48.980 J9.119 E0.19368 G1 X70.885 Y96.451 E0.00003 G1 X71.004 Y96.108 E0.00958 G1 X71.045 Y96.067 E0.00153 G1 X71.045 Y95.994 E0.00193 G1 X71.172 Y95.641 E0.0099 G1 X71.173 Y95.641 E0.00003 G3 X71.494 Y94.849 I6.106 J2.014 E0.02269 G1 X71.494 Y94.779 E0.00185 G1 X71.629 Y94.434 E0.00978 G1 X71.63 Y94.434 E0.00003 G3 X75.242 Y87.110 I45.520 J17.897 E0.21581 G1 X75.241 Y87.11 E0.00003 G1 X75.462 Y86.746 E0.01124 G1 X75.463 Y86.746 E0.00003 G3 X78.124 Y82.832 I41.949 J25.658 E0.12497 G1 X78.125 Y82.833 E0.00004 G3 X92.106 Y70.243 I39.455 J29.756 E0.49970 G1 X92.106 Y70.244 E0.00003 G3 X98.235 Y67.119 I25.448 J42.338 E0.18176 G1 X98.235 Y67.12 E0.00003 G3 X107.248 Y64.278 I19.269 J45.397 E0.24985 G1 X107.248 Y64.279 E0.00003 G3 X111.066 Y63.621 I10.367 J48.747 E0.10232 G1 X111.066 Y63.622 E0.00003 G3 X112.776 Y63.426 I7.231 J55.533 E0.04544 G1 X112.776 Y63.427 E0.00003 G3 X114.491 Y63.292 I4.331 J44.062 E0.04541 G1 X114.491 Y63.293 E0.00003 G3 X120.509 Y63.293 I3.009 J48.705 E0.15896 G1 X120.509 Y63.292 E0.00003 G3 X122.224 Y63.427 I-2.616 J44.197 E0.04541 G1 X122.224 Y63.426 E0.00003 G3 X123.934 Y63.622 I-5.309 J53.877 E0.04543 G1 X123.934 Y63.621 E0.00003 G3 X126.472 Y64.023 I-6.489 J49.181 E0.06786 G1 X126.472 Y64.022 E0.00003 G1 X127.308 Y64.185 E0.02248 G1 X127.308 Y64.186 E0.00003 G3 X133.549 Y65.886 I-9.704 J47.930 E0.17087 G1 X133.549 Y65.885 E0.00003 G3 X135.170 Y66.475 I-16.258 J47.191 E0.04555 G1 X135.17 Y66.474 E0.00003 G1 X135.566 Y66.629 E0.01122 G1 X135.566 Y66.63 E0.00003 G3 X142.890 Y70.242 I-17.897 J45.520 E0.21579 G1 X142.89 Y70.241 E0.00003 G1 X143.254 Y70.462 E0.01124 G1 X143.254 Y70.463 E0.00003 G3 X147.168 Y73.124 I-25.658 J41.949 E0.12498 G1 X147.167 Y73.125 E0.00004 G3 X159.757 Y87.106 I-29.686 J39.391 E0.49967 G1 X159.756 Y87.106 E0.00003 G3 X162.881 Y93.235 I-42.338 J25.448 E0.18176 G1 X162.88 Y93.235 E0.00003 G3 X165.722 Y102.248 I-45.311 J19.242 E0.24987 G1 X165.721 Y102.248 E0.00003 G3 X166.574 Y107.772 I-48.297 J10.286 E0.14760 G1 X166.573 Y107.772 E0.00003 G3 X166.707 Y115.509 I-48.955 J4.718 E0.20448 G1 X166.708 Y115.509 E0.00003 G3 X166.573 Y117.224 I-44.197 J-2.616 E0.04541 G1 X166.574 Y117.224 E0.00003 G3 X166.378 Y118.934 I-53.877 J-5.309 E0.04544 G1 X166.379 Y118.934 E0.00003 G3 X165.979 Y121.467 I-49.888 J-6.580 E0.06772 G1 X165.98 Y121.467 E0.00003 G1 X165.815 Y122.308 E0.02262 G1 X165.814 Y122.308 E0.00003 G3 X165.008 Y125.674 I-47.136 J-9.507 E0.09140 G1 X165.009 Y125.674 E0.00003 G3 X164.114 Y128.549 I-48.374 J-13.482 E0.07949 G1 X164.115 Y128.549 E0.00003 G3 X163.525 Y130.170 I-45.295 J-15.568 E0.04555 G1 X163.526 Y130.17 E0.00003 G1 X163.371 Y130.566 E0.01122 G1 X163.37 Y130.566 E0.00003 G3 X159.758 Y137.890 I-45.520 J-17.897 E0.21581 G1 X159.759 Y137.89 E0.00003 G1 X159.538 Y138.254 E0.01124 G1 X159.537 Y138.254 E0.00003 G3 X156.876 Y142.168 I-41.949 J-25.658 E0.12497 G1 X156.875 Y142.167 E0.00004 G3 X142.894 Y154.757 I-39.386 J-29.680 E0.49970 G1 X142.894 Y154.756 E0.00003 G3 X136.765 Y157.881 I-25.448 J-42.338 E0.18176 G1 X136.765 Y157.88 E0.00003 G3 X127.752 Y160.722 I-19.269 J-45.397 E0.24985 G1 X127.752 Y160.721 E0.00003 G3 X123.934 Y161.379 I-10.367 J-48.747 E0.10232 G1 X123.934 Y161.378 E0.00003 G3 X122.224 Y161.574 I-7.231 J-55.533 E0.04544 G1 X122.224 Y161.573 E0.00003 G3 X120.509 Y161.708 I-4.331 J-44.062 E0.04541 G1 X120.509 Y161.707 E0.00003 G3 X117.926 Y161.798 I-2.993 J-48.256 E0.06823 G0 F9000 X117.942 Y161.198 G2 X117.517 Y161.200 I-0.442 J-48.698 E8.06554 F3000 G1 X117.942 Y161.198 E0.01122

This is that same layer infill from Cura 4.9 beta. Again ran through arc welder. All settings the same.

;TYPE:FILL G3 X120.509 Y161.708 I-0.425 J-49.298 E8.10794 F3000 G3 X117.926 Y161.798 I-3.012 J-49.328 E0.06823 G0 F9000 X117.942 Y161.198 G2 X117.517 Y161.200 I-0.442 J-48.698 E8.06558 F3000 G1 X117.942 Y161.198 E0.01122

I air printed both, the stuttering is present with the first full gcode but not the second.