Blenderguru's Coffee tutorial: Coffee does not reflect correct in Viewport/Rendering UPDATE:
So resetting default preferences helped. But I checked the preferences file (not readable with editor). I then screenshot evry settings tab and compared with factory settings. There was no change then 1 addon: NodeWrangler. Deinstalling Nodewrangler didnt help, first the factory reset.
So there must be a different option somehwere else which is also saved in the userpref.blend .
Perhaps anyone else could imagine?



I followed BlenderGurus Beginner Tutorial, and in Part 4, Level 3: Realistic Liquid - Blender Beginner Tutorial I have following problem.
In Viewport (Image right side) you can see the coffee shines more dark through the glass and has dark-reddish reflection on the plate/ground.
In the Rendering the glass looks very greyish and there is a highlight reflection on the plate/ground as if there is some lightsource or coffee won't be rendered correct.
The liquid is sized to fit between the both sides of the glass and I followed all material settings and couldn't find out where the problem is. Could you help me here?

Best Regards
Sören

 

It should look like this in Render: (from tutorial)


Update:
After the Answer of @Jachym:
Still same false behaviour for me:


Blender File:
I checked your file and everything seems to be working fine.
With such low samples, Denoiser can introduce some artifacts, so perhaps that's what happened.

Viewport (64 samples)


Render (128 samples)


Render (128 samples) + Denoise Node