You cant use any axe to strip logs from BYG, all other logs are working as intenden, you can however use create sawmill but it needs a filter for that recipe.

Can confirm; I've observed this happening with all modded logs. The Create sawmill seems to work on all of them as intended. I have not observed this happening on previous modpack versions (though I don't recall what those versions are); in said versions, all logs could be stripped by axe.

Is there a KubeJS script/datapack/something I could use as a workaround for the time being, or is this something that will be quickly/is already fixed?