Why is my ironing patchy?

This seems to have only just started happening and I’m not sure why, the ironing is patchy and leaves faint holes in the top layer which actually makes it look worse than if I didn’t iron at all

Is there anything I can do to fix/improve it? These are default ironing settings on Bambu PLA

Did you change the infill pattern or lower the infill %…??

No it’s all standard settings. Gyroid infill 15%

I’m going to try the new crosshatch see if it makes a difference

i also get the same problem. How can i prevent it?