15 minutes on a Cisco Nexus 9k and already found a cute bug.

SYSMGR-2-CFGWRITE_ABORTED_CONFELEMENT_RETRIES: Copy R S failed as config-failure retries are ongoing. Type "show nxapi retries" for checking the ongoing retries
# show nxapi retries
#1. Dn: sys/vpc/inst/dom/keepalive, Operation: modify, Src: vpc bmp: 0x4.

Quickest stupid work-around I could find:

# copy running-config bootflash:latestconfig.txt
# copy bootflash:latestconfig.txt startup-config 
# reload

And there’s a similar looking bug:

# copy run start
[########################################] 100%
Configuration update aborted: request was aborted