Experiencing exactly the same issue.
We have an iconset of 350+ elements that get fetched from our file via the API, and transformed to React components and optimized as SVGs that require the stroke to be maintained. After working well for about a year, this change totally broke that pipeline.
Was it intentional? I can’t find any documentation on it. The only thing that seems like it might be related is the svg_simplify_stroke parameter, which has no effect.
Another user seems to have also observed this issue here.