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I'll give it another spin. Maybe I also made a mistake in the implementation. Whenever I set a bigger MTU size of 23 the SDK returned me an error 7 which is INVALID_PARAM. In the docs they say it's due to the fact that the maximum MTU size is smaller than the requested one, but I did update all the maximum MTU size definitions.
SoftDevice 3.0 used with SDK12 should support larger MTUs
https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/s132-v30-production-version-now-available-from-nor