I have noticed a strange behavior from the GLB exporter the other day when loading a glb file to https://gltf.report/
The file had an armature with animation and few more animated objects and static ones, the odd thing was when exporting the GLB the report showed animation keyframes on the static objects that had no keyframes or animations on them at all(!)
I am sharing few examples for you to look at https://filebin.net/vmzajtl4ys8wqpur