In version 2.6.1, functions are not properly recognized when accessing via '$' sign. This means you can no longer see it is a function, you don't get the automatic '()' when accessing it, and you also aren't shown the arguments of the function.
For illustration, this is how they used to show in 2.5.1:

Now in 2.6.1:

I am on:
R version 4.4.1 (2024-06-14 ucrt)
Platform: x86_64-w64-mingw32/x64
Running under: Windows 10 x64 (build 19045)
(RSTudio 2024.09.0 Build 375)