Export multiple collection as "Mark as asset "

Hi,
I try to create more collection with some elements inside. Than i mark as asset 5 collection, but when i try to export this in 1 unique file with this script, make an error (he can't export more mark as asset contemperary in 1 file)

Start with the export script and reproduce the reported workflow: create several collections, mark five as assets, and export them together into one file. Inspect the resulting error and the collection/asset export path; done means all marked collections export successfully into a single .blend file.

Written by the indexing model from the issue text.