AVR128DB48 System clock not set on upload.

[ScottBillingsley]

I am developing a business size board using the AVR128DB48..I'm using a clean install of DxCore 1.5.11 and Arduino IDE 1.8.19..So far all my test have worked fine but I am unable to change the system clock on upload..I am able use protected write in the setup to set the clock but was wondering if this is a problem with this processor..I also have the Curiosity Nano version and it behaves the same...

[SpenceKonde]

I belive you ran into the same issue I did last week, fixed in github now. I got a test backwards, and so rather than taking over the internal oscillator to clock TCD at an ideal rate only when the internal oscillator was not being used for the system clock source, I had it taking over the internal oscillator and setting it to a different speed whenever the internal oscillator was being used for the system clock and hence was not available for that purpose.