Your_average_minecrafter according to the newest Minecraft update the "Client now sends additional updates about packs (like download success)". If i understand this correctly it should now be possible to spoof resources packs.
Alexander01998 Your_average_minecrafter It was always possible to spoof resource pack acceptance. If anything it might be slightly more complicated now because you have to send that additional packet.
Your_average_minecrafter so can add resource pack spoof it might be useful for hide and seek among other stuff