This is a nasty bug for which we will release a new patch version shortly. It turns out that on Net8 8.0.3 and 8.0.4 the External Procedure functions are not present, and Direct Oracle Access concludes that this is not a complete OCI8 library. Therefore it switches to OCI7. On Net8 8.0.5 and later it works just fine.
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Marco Kalter
Allround Automations