I have watched three episodes of Renegade Nell, a fantasy adventure on Disney+ about a highwaywoman with supernatural abilities in England in 1705, and I am not sure if it qualifies as belonging to the swashbuckling genre, but I am sure about three things: it has the spirit of a good swashbuckling tale; I'll continue to watch it; and it's far, far better than this year's version of Zorro (q.v.).
Bonus: It stars Louisa Harland, who played Orla McCool in Derry Girls.