Have there been any changes in this regard with the time of Bitcoin Core 0.16? Then it was done well and all OK nodes accepted the second transaction with a higher Commission first, and the old one was forgotten later and discarded
However, just as I described above, if you create another transaction spending the same inputs but with completely different outputs then most nodes by default will reject such transaction.
Perhaps something has changed then, after all, before without problems you do double spending with a higher Commission and before the first is held and the first is discarded. Truth so was on Bitcoin Core wallet, on Electrum here is only until try to understand as to remove from applications transaction to anew broadcast another already suppose