I have a number of scenes that I am exporting to webscene, and I have experienced an issue where the webscene exports successfully but fails to load. They return similar errors (usually TypeError) at similar points in the loading process. Some of these I have been able to solve by reverting to default export settings and re-exporting the scene.
Currently, however, I have a webscene that will not load no matter what export settings I use or how many times I re-export. It reads 96% and then fails at Invalid Web Scene (3ws) data TypeError: Cannot read property 'data' of undefined