Question URP loses whopping 3ms of CPU time once a single Hybrid Renderer entity is spawned

Hello!

I've run into a pretty big problem.

I have a game where I use URP and a hybrid DOTS approach - most things are handled in the regular way but if there's a lot of them I use the DOTS stack.

Since it's a city builder I spawn citizens using DOTS - a very simple 10-ish vertice model with a URP simple lit material, GPU instancing enabled, entirely spawned as an entity so rendered using the hybrid renderer (latest, v2).

The problem is, as soon as I spawn even a single one I suddenly gain like 3ms of CPU time from URP.

Here's the profiler screenshot before I spawn entities:


And here's after:


When I zoom in to the part that gained 3ms it seems that most of it is spent on culling? I tried turning off the model dynamic culling but that doesn't fix it.


I'm pretty sure this problem came at some point after I started the project and wasn't there from the start - perhaps a setting I overlooked or a quirk in a URP update?

Anyway, if anyone has any idea what might be causing this I'd be really grateful!