NES SNAC unable to detect controller, SNES core SNAC is able to detect controller

[40wattrange]

Not sure if this is a "bug" or a feature request, but through testing I have seen that the SNAC function in the NES differs in ability to detect and use controllers from the SNES core. Obviously they are different systems, so maybe that is why, but I find that things function 100% in the SNES core, where-as they do not on the NES core. Link to a video showing the results at the bottom.

Using the NES core I tested the following, with the following results:
Working:
SNES controller on SNES SNAC dongle
SNES controller w/ SNES to NES adapter on NES dongle

Not working:
OEM NES controller on NES dongle

Using the SNES core I tested the following, with the following results:
Working:
SNES controller on SNES SNAC dongle
SNES controller w/ SNES to NES adapter on NES SNAC dongle
OEM NES controller on NES SNAC dongle

If possible, could changes be made in the NES SNAC implementation that would be more in line with how the SNES implementation is handled since it seems to detect OEM NES controllers without issue?

https://www.youtube.com/watch?v=rn4lW6CuFno

[Kitrinx]

the implementation of SNAC in NES and SNES cores are effectively identical. The cores themselves and how they read controllers are radically different of course (following the extreme difference of the hardware itself), and there's no chance the logic of reading controllers will ever be changed in the NES core.

If you have an OEM NES peripheral that is not working correctly, then the implementation of the voltage level converter is likely to blame. The protocol (Latch, clk, data) is ultra-simple for nes/snes and I see nothing that really could be changed to change t he outcome regardless.

[40wattrange]

Figured that was the case. I have an old SNAC adapter that works fine - just was confused when I saw the NES controller light up in the SNES core - figured I'd raise it up just in case.

Whats odd is that it /did/ work at one point so wasnt sure if something changed - couldnt tell you how long ago that was though.