ALL of these Cyrillic filename patterns fail:
Simple Cyrillic names:
+```
пожелания.md
обучение.xlsx
Протокол.xlsx
Согласие.docx
Грейдинг.pptx
+```
Names with numbers/dashes:
+```
ДПК_2021.06-2.xlsx
Скрипты_3.xlsx
РТ МВНП v1.docx
РТ МВНП v2.docx
-
+```
Names with spaces:
+```
ВУП Авто .pptx
Ваш юрист.pdf
-Names with underscores/special chars:
+```
+Names with underscores/special chars:
+```
ВУП_видео.mp4
Ачох_кейс.dat
+```
Various file extensions affected:
-
+```
.docx, .pptx, .xlsx (originally reported)
.md, .pdf, .mp4, .dat (newly discovered)
+```
Originally reported YYYY.MM pattern (confirmed):
+```
ЦППП_2022.01.xlsx, ЦППП_2022.02.xlsx, etc.
+```
Revised pattern analysis
Failing pattern: [ANY_CYRILLIC_CHARACTERS].[ANY_EXTENSION]
-Working pattern: Latin-only filenames work fine
+Working pattern: Latin-only filenames work fine. Some non-latin works some not.
This regression affects ANY non latin filename, making git-annex 10.20250721 essentially barely usable for repositories containing non-latin filenames.