The issue has now been confirmed upstream by XWayland developer Olivier Fourdan.
The fix is already present upstream in commit c39b1591 (“xwayland: Do not use 
pointer crossing count for slave devices”) and has also been backported to the 
xwayland-24.1 branch in commit 0ca92fb4.
Olivier Fourdan has advised that Ubuntu should update its XWayland package to a 
current version containing this fix.
Ubuntu 26.04 currently provides XWayland 2:24.1.10-1, which is the version 
affected by this problem.
I tested my locally rebuilt 2:24.1.10 package with the one-line upstream fix, 
and it successfully restored Wacom pen input in Xournal.
Upstream issue: https://gitlab.freedesktop.org/xorg/xserver/-/work_items/1926
Please consider backporting the upstream fix to Ubuntu 26.04 or updating the 
XWayland package to a version containing the fix.

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https://bugs.launchpad.net/bugs/2169242

Title:
  Wacom tablet input broken in GTK2/XInput applications with XWayland
  24.1.10, and the fix for the bug

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