Near the comets core, it now appears a Yin-Yang like, symbol. Very apt for this comet. At last perihelion in 1954, there were no CCD cameras and image processing software available to bring out almost hidden details. Today, the situation is completely different.
The 3 latest images looks strange because I block the bright comets core. I also use exponential stretching to bring out low contrast details in the comet's head.
I have seen such spiral structures before in other comets, for example Hale-Bopp ( in a 24" reflector ).

Wikipedia - 12P/Pons–Brooks & History

BAA lightcurve

Sun distance (au): 1,25 Perihel : 21.April 2024 Sun distance (au): 0,78

Time: 18:30UT 2024-02-26 Exp.70 x 30sec
Tel: 0.254m f/7.3 ST-10XME CCD 2x2bin 1.5"/pix
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.