@francislavoie Thanks for responding 
Does this mean I shouldn’t have to take any further action i.e. the permalinks issue should inherently be addressed in Caddy V2? If so, ideas on how to proceed from here e.g. debug?
OK. I’m still getting my head around this. Sometimes {URI} is used as in…
rewrite @subdir /my_subdir{uri}
I’ve recently become comfortable with this after you explained it to me in Www handling - Use the same multiple site definition or use redirection? - #10 by francislavoie
Now you’re indicating sometimes I need to be more specific and use a subset of the URI. I need to think about this a bit more. How do I decide when I should use one or the other?