Follow-up Comment #1, bug #48055 (project findutils):
Paul Eggert comments:
I can't seem to reproduce the problem on Fedora 24, so perhaps it's been fixed
already.
$ ls
a.lower b.UPPER
$ LC_COLLATE=pl_PL.utf8 find -regextype gnu-awk -regex '.*[a-z]{5}$'
./a.lower
$ LC_COLLATE=pl_PL.utf8 find -regextype gnu-awk -regex '.*[A-Z]{5}$'
./b.UPPER
$ find --version | head -n1
find (GNU findutils) 4.6.0
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