+Report : https://www.mail-archive.com/search?l=mid&q=20210125200655.e27xaaoy2belyxhw%40tallinn
+Report : https://www.mail-archive.com/lyx-devel@lists.lyx.org/msg218248.html
+
+Testing compilation after lyx2lyx roundtrip was not helpful in this case:
+report : https://www.mail-archive.com/lyx-devel@lists.lyx.org/msg218232.html
+ctests : de/UserGuide_lyx(22|23)
+
+
+Examples where an upstream issue was reported and ended up wasting time:
+
+Report : https://github.com/latex3/latex2e/issues/836#issuecomment-1159826566
+ctests : export/templates/Obsolete/.*American_Geophysical_Union.*_(lyx22|lyx23|pdf|dvi).*