Hi there,
I’ve got exactly the same problem as the user “mihailmihno” described above.
Stomp just doesn’t show up in my renders, only the background shows up.
I tried EEVEE, workbench, and cycles. Nothing seems to work.
I also double-checked restriction toggles and they are enabled for renders (for Stomp).
The weird thing is, that I can see Stomp in a 3D viewport in viewport shading as render preview as you can see below.