When importing transactions from an OFX file containing transactions from multiple accounts it is nearly always important to know which account the transaction will be imported into. This is not shown on the transaction matching window. Sometimes the information can be derived if there is a potential matching transaction detected, but if not, there is no way to figure it out.
Created a possible fix in PR436, waiting for approval.
This was fixed in commit 03da611 of PR #436, which got merged in commit 9921ab2.