Since this whole 'W' thing is outrageous, not being able to use jump sucks -biiig time-, after some tinkering -nothing helped-, I actually tried with a controller - maybe all the people not complaining were on controllers, yes? ...and the same result, lol.
However, eureka! As here be the solution: just need to effing turn 'Current Format' to Japanese under regional format for you system (in the Region Settings), if you want to play the game without this truly annoying bug...
There must be some reason as to why, but it sure beats me... Quite maddening at any rate, lol! Still, there you have it... The jump works! Yay!! (and maybe possibly the sword attack as well, for those who had it bug out)
Also, NEVER use ReiPatcher, ONLY BepInEx!! You've been warned...