Nincompoop

Hi! Can someone please point me to the correct FAQ or place? I'm not able do DuckDuckGo myself out of this one. As you can hopefully see, chunks are not rendered. I run a forge server, fresh install on a linux VM. Curseforge on the Win11 client with Embeddium, Oculus and Unbound shader. No mods. Forge 47.2.23 on server & client. No errors, no crashes, no apparent CPU or RAM issues with the VM. This screenshot was captured while creative, but the same happens when flying in survival. Waiting (floating) for a few minutes sooner or (often) later, lets the missing chunks appear. Usually takes 5-10 minutes. When on a local game, the chunks appear slowly, but they do appear without pause. This must be something simple, obvious, but I can't find the correct "search words" to find my way out. "Chunks not loading / rendering" didn't help. Browsing several forums neither.