General Routing Question -- Mono/Stereo

“Some blocks, such as amp models are always mono. Some others like reverbs are always stereo. So when building your signal chain, its important to understand when stereo signals get summed to mono in a downstream block”

Is there a list that tells us what, other than amp and reverb blocks (always the two things mentioned in this discussion), are blocks that are always stereo or always mono? It’s not in the manual, not in the virtual device list site.