Sakia 0.20.7 seems to create V2 transactions
I tried to send a transaction to Remuniter's key TENGx
(first with Cesium which does not allow direct sending to a pubkey, see duniter/cesium#114), but after the "successful sending" via Sakia, I could note on my node that the sent transaction was recorded in V2 on Duniter side and would never be written.
I wanted to check in Sakia if it did really send a V2 transaction or if the problem came from Duniter side, but the right click "Copy raw transaction to clipboard" does not copy anything to the clipboard. However, "Copy transaction block to clipboard" does work.
So ... I can only suppose the generated transaction is V2 right now, but could you verify also on your side?
I'm using Sakia 0.20.7 Windows x64 build.