This conversion from Dollar('$') to ('#') is occuring from the below code snippet inside Sitecore.DevEx.Serialization.Client.dll, which converts all the invalid file characters to '#' symbol.

I believe the changes were made to address and convert all the invalid characters to '#' using above code snippet.

Below is the list of characters that are considered to be avoided in filenames.

https://www.mtu.edu/umc/services/websites/writing/characters-avoid/

Hope this helps!!!

This conversion from Dollar('$') to ('#') is occuring from the below code snippet inside Sitecore.DevEx.Serialization.Client.dll, which converts all the invalid file characters to '#' symbol.

I believe the changes were made to address and convert all the invalid characters to '#' using above code snippet.

Inside version 4.2.1 of Sitecore.DevEx.Serialization.Client dll, invalid file characters were replaced with underscore('_') symbol.

Below is the list of characters that are considered to be avoided in filenames.

https://www.mtu.edu/umc/services/websites/writing/characters-avoid/

Hope this helps!!!