Yes I have two monitors and that seems to be the issue.
I have a Macbook pro 16 inches late 2019
2,4 GHz Intel Core i9 8 core
AMD Radeon Pro 5500M 8 GB
Intel UHD Graphics 630 1536 MB
64 GB 2667 MHz DDR4

Supplementary Monitor is an LG Ultra HD 27 inches connected via SS

When I unplug the monitor, I see the Notation populated. If I plug it back, the notation becomes empty.

If I select movable Notation Window it works even when the supplementary monitor is plugged.
So the issue seems to be related only to the docked windows on a 2 monitors configuration.

Last edited by Alfredo Elia; 6 hours ago.