You can see that after entering various txn from a register, the general ledger window show many void txns, apparently the same number of void tnx and with the same dates as the tnx you entered.

For example:
-gnucash --nofile
-file -> new -> new account page
-generate new accounts a and b
-in the register of account a enter a txn with b
-tools -> general ledgers shows a void txn

If you enter more txns you'll have more void txn in general ledger.

That's confusing for the user. Besides that, if you try to delete them you can't.

If you save and exit gnucash, next time you open that file the void txns have disappeared.