Does this look more like moisture in the filament (which bends, does not break), or something like a clogged head? The bottom layer of the print looks fine.
It looks like it could be overextrusion because I’m pretty sure that the nozzle you are using is brass and that has caused the opening to enlarge. Basically unless you changed the carriage assembly then it hasn’t been changed.
I haven’t changed the carriage… where are the carriages with steel nozzles kept?