Consider 3 function declarations:
let a x = ()
type T() =
let b x = ()
do
let c x = ()
()
a provides info about its parameters:

b and c don't:

Without this info it's problematic to provide rich tooling experience, as the features like Parameter Info popup need the parameter names. In addition to that, b doesn't provide its declaring entity.
The apparent difference between a and b or c is that the latter don't return any data from their TypedTree.ValRef.ValReprInfo properties. The data seems to be kept somewhere, as (at least) b has its parameter name compiled.
@dsyme Do you have an idea of how the missing data could be added?