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This also applies to the brake and road wear emission flows.

This seems to be a relic of the modeling of waste flows as negative inputs in previous versions of ecoinvent. These negative value generate negative results during Monte-Carlo simulations.
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I am referring to the ecoinvent v3.6 cut-off database.
In fact, this seems to be the case for the waste flows of all the datasets I have checked.

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The issue with the negative uncertainty values for the waste flows has now been resolved. The updated databases are available for download from https://nexus.openlca.org/database/ecoinvent

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Yes, you are right, and this is indeed incorrect, and happened when we created the waste flows instead of products. We will fix this with a new version.

Thank you for spotting it!