Typing umlaut with US intl keyboard altgr

I use Arch Linux, Audacity 3.2.4 (distribution release 1:3.2.5-1)

I have a US intl keyboard and would like to type öüäæß etc using the altgr key
to type german/french and other languages in the label tracks.
However audacity interprets altgr as ctrl+alt.
This means that e.g. altgr+u registers as ctrl+alt+u (unmute) instead of ú.

Steps to reproduce:

  1. Set keyboard to us intl.
  2. Press ctrl+b then altgr+u (altgr is right alt)

Expected result: A ú appears in the label
Actual result: label remains blank

Workaround: copy and paste ú