Hi! Several shapes are not visible in the saved svg file. These shapes neither show in an image viewer nor in a browser but only in Inkscape. In the "connection_ok.svg", waves are invisible elsewhere.

I have copied one of these arcs into a "test.svg" file and put a new arc next to it. The latter(green) arc is visible but the copied one(red) is not.

I don't know why a circle is named either as a path or a circle? Whenever I draw a circle, it is named as path even when holding the shift. For this reason, I can't reproduce the issue. Sorry if this is a dumb question but I feel like this could be a bug.

I doubt the red arc is a plain copy of the green one because it has other description in XML code and wears a transform attribute.

Why the wifi arcs are missing is strange - all have some transformation matrix and probably the rendering of these parametric circle features are not supported by browsers and such.

Converting with Object to Path will instantly solve the issue - but I can understand if you want to to keep the parametric status.

Had a little chat in the Chat. Either it´s not from Inkscape or a very old version as Circles are not described with attribute "d". Drawing in Inkscape will correct the file instantly!

Replacing "circle" with "path" in the file with a text editor also seems to fix the problem. The red arc's transformation and stroke width were modified after the copy.

The version is "Inkscape 1.1 (c4e8f9e, 2021-05-24)" and OS is Ubuntu 20.04 64-bit with kernel 5.8.0-55-generic. Running "Inkscape-c4e8f9e-x86_64.AppImage" executable downloaded from the website. If "d" is a deprecated attribute that is not supposed to be there then I have no idea.

I´m confused too, because I have no clue how to avoid "d" as it appears on partially circles and every time I draw a new arc it appears on your icon.