Hyphenated database names do not work with dbStats.fsUsedSize / TotalSize

I have the following two databases:

and configured Mongo to store each one in a separate folder:

These two databases are stored under /mnt/disks/mongodb/data path. The data folder is also owned by mongodb user/group.

I'm trying to run the following command for each database:

In case of test it works fine, but in case of test-hyphen I get this error:

Mongo cannot calculate fsUsedSize and fsTotalSize for this database. I suppose it is a bug related with a fact of translating the hyphen to ".45".

Could you please confirm?