When running Qt6.8.or Qt5.15.12 in germany, QSqlQuery::bindValue handles QDate differently for insert and select (or delete) queries.
(The issue might be restricted to the Oracle QOCI plugin. Using sqlite the code works.)

Consider the dates
   QDate date_summer(2025,10,24);
and
   QDate date_winter(2025,10,28);

Inserting those works fine.
But selecting for those dates does not work for date_summer.
Qt selects 2025-10-23 23:00:00 instead of 2025-10-24.

The reason seems to be that on 2025-10-26 Germany switched to
winter time (i.e. UTC+1 instead of UTC+2).

The attached code illustrates the issue:
the first find does not find a record for 2025-10-24, after
inserting 2025-10-23 23:00:00 the find for 2025-10-24 finds the record for 2025-10 23:00:00.