Steps to reproduce:
# Go to [[https://de.wikipedia.org/wiki/Liste_%C3%B6ffentlicher_B%C3%BCcherschr%C3%A4nke_in_Nordrhein-Westfalen|Liste öffentlicher Bücherschränke in Nordrhein-Westfalen]]
# Open the page in the source code editor (not NWE, but the regular wikitext editor)
# Without changing anything, scroll down and select "Änderungen zeigen" (the problem also appears when using "Vorschau zeigen", but the diff makes it more obvious)
# Note that there is not a single change to the article
# Immediately switch to visual editing using the pen in the upper right-hand corner of the textbox (the problem also appears when switching by clicking the "Bearbeiten" tab)
# Observe that "Änderungen veröffentlichen" is blue, indicating that a change has been made
# Click "Änderungen veröffentlichen" and look at the diff:
{F24014707}
There should be no changes, but in fact content has been removed.