Room Size = 0 in Reverb audio effect still produces reverb

[yosimba2000]

When setting the Room Size == 0 in Reverb audio effect, there is still very significant reverb being created.
This doesn't make sense, as 0 room size should mean a non-existent room, which means no reverb.

Also see #11125

edit I probably should have posted this under Issues instead of Proposal/Discussion.