This is a regression from 1.3 -- this behavior works as expected in 1.3, but not in 1.4.
Result: no change to entries available
In 1.3, this would result in the new transactions becoming visible on the transaction list, allowing you to complete the reconciliation.
In 1.4, nothing seems to trigger this desired behavior -- Save is broken, re-opening a report does not regenerate the transaction list. The only solution is to generate an entirely new reconciliation, which makes this process extremely annoying.
https://github.com/ledgersmb/LedgerSMB/issues/979