Strange editor UI labellings

An interesting UI phenominon after updating to v4.0.9.

I have found no information via Googling, and am not even
certain exactly how I would research it properly-!

Happening on a Nanopi Fire 3, a raspberry pi 4 and a Windows 10 PC.
It is apparently not destabilizing, just visually peculiar
as I've never seen the phenomenon occur before,
and am wholly uncertain of how to correct it
before I pursue any further edge device updates.

Any ideas / recommendations / advice?

Did you have refreshed your browser?

Yes, caches cleared and visited from other physical Internet locations with Chrome, Chromium and Edge, all with the same result - it is text being served by various updated Node-RED installs.

Is this only happening on the Dashboard sidebar, or also elsewhere too?

Erm, not sure what I am supposed to be looking at here, my Dashboard 2 sidebar looks exactly the same?

I have seen that too in the dashboard sidebar, but do not have access to my PC at the moment to investigate.

DB 1.24.2
NR 4.0.9 & 4.1

Same issue. Only related to DB2 Sidebar.

@joepavitt, ui_template must be replaced by ui-base

All three affected edge devices apparently exhibit the phenomenon only in the sidebar.