Link to sheet named by number not working

Hallo LibreOffice Comunity!
Let me explain my discovered anomaly.
I Created a new spreadsheet and added a few sheets named by nr (2020, 2021…).
Tried to creat a link to that sheet, it doesn’t work.
Solved by renaming sheet by alfanumeric (year2020, year2021…)
Is that problem true?
Thank in advance for your confirmation.

Questo è il blog in italiano.