Hi,
I am probably being stupid but can't find the July 2021 release for Firestorm to download on their site - does anybody have a link? I mistakenly upgraded to the latest version and it no longer supports any non custom LODS using DAE when auto generated in the old "way". The issue is at my end versus theirs but until I can spend quality time on creating a new Second Life workflow I need to fix my Saturday Sale build
Background in case any other Cinema 4D users search for LOD issues:
Perhaps this is what you are looking for ?
https://wiki.firestormviewer.org/fs_older_downloads
Not sure if the following is useful for you but if you are uploading with Firestorm you can still choose the the old GLOD option for auto generating the lower LoD models.
In the mesh uploader under Source, for each of the lower LoD models you choose the Generate Reliable option. (= old GLOD method).
The following is a screenshot from Inra Peys "Living in a modern world