I was able to fix it!
What I did was to go to "Settings", "Extensions", "Pen", and then disable the "Enable big pen" option. After the touchscreen firmware was updated, I went back to the launcher and rebooted (just in case). Then I went back and enabled the big pen again, going back to the launcher and rebooting after the touchscreen update was successfully finished.
After that, the eraser works well in NeoReader (we'll see if that also fixes the stability issues).
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