Ok so, I think I've figured it out some issues with this new implementation :
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For the L.geoJSON => The issue appears when I try to bind a Tooltip (layer.bindTooltip()) on the layer with the function OnEachFeature; => trigger the error "This layer type does not support tooltips." I was able to run the code before so I suppose that I've to tweak some elements now.
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For the L.Circle => The issue appears with mouseover because this event triggers the method setStyle of the element Circle. Then the circle disappears and there is no error in the console..
I think my installation is good with your suggestions, if you have any ideas about these issues I will be very grateful ! Thanks.