Hi Martin, In the 16.0 alpha <https://www.unicode.org/review/pri497/pri497-background.html> & beta <https://www.unicode.org/versions/beta-16.0.0.html>, we had prominent notices for characters with unusual combinations of normalization properties, with a permanent writeup here: https://www.unicode.org/reports/tr15/#Contexts_Care
We also did add several relevant test cases in NormalizationTest.txt. Viele Grüße, markus
