Are the primary and secondary conjugations dans le présent common to one French-speaking country or another or are they newer/older versions?
I think the link above will help with your query.
The classical variant (j'assieds, etc...) is considered a higher register and more literary. Using j'assois is more common in everyday spoken French. I even heard people using a mix of both conjugations, with one for the singular and the other for the plural.
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