I read at hollowknight.fandom.com, that Elderbug after you get Vengeful spirit has a dialogue hinting at Green path. But it is bugged and substituted by Fungal Wastes hint.
If it's true, it's just embarrassing.
Any fixes, any way to communicate to Team Cherry?

Yeah, as I can attest to, this problem still exists on the Switch version. Luckily, as you're likely already aware of by this point, that bug [no pun intended] has long since been patched on pc. Don't know how it is on PS4 or XBox One, as I don't own the latter system, though I do have a PS4, just don't have Hollow Knight on that system.