Steps to reproduce:

Run the following WXPython example, and try to adjust the slider with the 4 arrow keys.

import wx

class MainWindow(wx.Frame):
	def __init__(self):
		super().__init__(None, title="Test")
		panel = wx.Panel(self)
		slider = wx.Slider(panel, style=wx.SL_VERTICAL)
		panel.Layout()
		self.Show()

if __name__ == "__main__":
	app = wx.App()
	wnd = MainWindow()
	app.MainLoop()

Actual behavior:

UP arrow decreases the slider, down arrow increases it. Left and right arrows seem to work fine, though.

Expected behavior:

Up arrow should increase the slider, and down arrow should decrease it, same as every other slider.

System configuration

NVDA installed/portable/running from source:

Installed

NVDA version:

2022.1

Windows version:

Windows 10 21H1 (64-bit) build 19043.1706

Name and version of other software in use when reproducing the issue:

N/A (happens anywhere there's a vertical slider).

Other information about your system:

N/A

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

2021.3.5 also had this issue.

If NVDA add-ons are disabled, is your problem still occurring?

Yes.

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

N/a, but yes