I have 2 notifications telling me that 0.18 is available. While I’ve tried both downloads neither of them completes (stopping at about 70 % progress) nor installs (green Android robot says “No command” after reboot). Any help or experience with this issue? 
showing two entries is not a bug - there really are two 0.18-q images on the dl host (and I think the ota server then too) for surnia
e-0.18-q-20210828132307-dev-surnia.zip
e-0.18-q-20210814129945-dev-surnia.zip
When did you last flash the recovery partition? mostly it’s the date you transitioned to /e/. If its far behind, you could flash your recovery partition to a current version. This is where the download is applied from, maybe some binary is missing.
I asked a surnia owner about the
Android green robot → “No command”
The green robot is motorola stock recovery, i think
did you ever flash the recovery partition? point 5. in https://doc.e.foundation/devices/surnia/install
get it here: recovery-e-0.18-q-20210828132307-dev-surnia.img