Same issue here... I have had this issue since I got this laptop that came with Win11.
Can't figure out what exactly causes it... It just appear to happen randomly...
Right click on the icon doesn't help. But if I left click twice, to maximize and minimize the window, it appears again.
I usually have to do it several times, since I have several programs open and don't know witch is witch (also because windows keep rearranging the icons...).
Dell Inspiron 15 5510
11th Gen Intel(R) Core(TM) i7-11390H @ 3.40GHz 2.92 GHz
RAM 16,0 GB
NVIDIA GeForce MX450 2,0 GB