No new issue, at least not with the feather ;-). Working with the nrf9151 feather is fine for me.
Working with other nrf9151 based devices and a jlink a was also faced the “device is protected, please recover” stuff. But using a reset the also helps, without recover. And some more investigation then resulting in this topic in the erratas.
And remembering some starting issues with the nrf9151 and rs-probe, I thought adding this note will be helpful for others.