It appears that LightBurn has problem with shapes of small SVG files.
Blue is how shape looks like in Inkscape and in SVG.
Black - what LB imported (shapes are rescaled from extremely tiny input)
malformed SVG:
<svg xmlns="http://www.w3.org/2000/svg" width="2.782987270038575" height="2.7800853326916695" baseProfile="full" version="1.1" style="stroke:none;fill:#00f"><defs style="stroke:none;fill:#00f"><style type="text/css" style="stroke:none;fill:#00f">polyline,line,rect,path,polygon,.polygon{fill:none;stroke:#000;stroke-width:1px;stroke-linejoin:round;}* {stroke: none; fill: #00f}</style></defs><g fill_rule="evenodd" transform="scale(1,-1) translate(-2218326.9451473146,-6455840.314787209)" style="stroke:none;fill:#00f"><g id="lone_squares" style="stroke:none;fill:#00f"><path d="M 2218326.94515,6455837.53470 2218326.94515,6455840.31479 2218329.72813,6455840.31479 2218329.72813,6455837.53470 2218326.94515,6455837.53470 z M 2218328.05834,6455838.64674 2218328.61494,6455838.64674 2218328.61494,6455839.20275 2218328.05834,6455839.20275 2218328.05834,6455838.64674 z" fill_rule="evenodd" class="polygon lone_squares" style="fill:none;stroke:#000;stroke-width:1px;stroke-linejoin:round;stroke:none;fill:#00f"/></g></g></svg>
SVG with complete loss of inner shape:
<svg xmlns="http://www.w3.org/2000/svg" width="0.556597454007715" height="0.5560169909149408" baseProfile="full" version="1.1" style="stroke:none;fill:#00f"><defs style="stroke:none;fill:#00f"><style type="text/css" style="stroke:none;fill:#00f">polyline,line,rect,path,polygon,.polygon{fill:none;stroke:#000;stroke-width:1px;stroke-linejoin:round;}* {stroke: none; fill: #00f}</style></defs><g fill_rule="evenodd" transform="scale(1,-1) translate(-2218326.9451473146,-6455838.090718867)" style="stroke:none;fill:#00f"><g id="lone_squares" style="stroke:none;fill:#00f"><path d="M 2218326.94515,6455837.53470 2218326.94515,6455838.09072 2218327.50174,6455838.09072 2218327.50174,6455837.53470 2218326.94515,6455837.53470 z M 2218327.16779,6455837.75711 2218327.27911,6455837.75711 2218327.27911,6455837.86831 2218327.16779,6455837.86831 2218327.16779,6455837.75711 z" fill_rule="evenodd" class="polygon lone_squares" style="fill:none;stroke:#000;stroke-width:1px;stroke-linejoin:round;stroke:none;fill:#00f"/></g></g></svg>