Then, usually stopover/transit change causes tax recalculation.
So probably, ticket reissue is needed.
Then, some airlines charge reissue fee.
CX JP ticketing office charges 3000JPY for reissue.
BTW, some airport tax exemption is applied for same day connection. So, if you change same day connection to the next day connection (but, less than 24 hours), tax is increased, but no routing change occured in terms of OWE rule (still transit).
Any experience of tax recalculation and ticket reissue fee in this case ?