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Omnibus F4 V3 Pro Diode Removal

Hello. I have been following the guide here on setting up Arduplane on an Omnibus F4 V3 Pro:

https://ardupilot.org/copter/docs/common-omnibusf4pro.html

In particular removing the diode so that I can isolate the servo power rail and power servos from the BEC on my ESC. However I am not sure it is working as expected. If I simply plug the battery in the servos spark into life and I can control them even tho the diode is not there and no external bec on the servo rail. Also plugging the powered bec into pwm1 powers the board. Surely if I have isolated by removing the diode this should not happen?

Video here: https://youtu.be/RdaOwGIE-O4

If I have the this wrong then what diode have I removed?! :joy:

Thanks

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