DBeaver not showing any Comments/Remarks in MSSQL
The Microsoft JDBC driver does not return that information through the standard JDBC API. I think the main reason for that is, that the driver uses sp_columns internally (at least the last time I checked - which is a couple of years back) and that procedure doesn't return that information. 

I guess DBeaver simply has no special code to retrieve the "extended properties" for tables or columns for SQL Server, whereas SQL Workbench/J "knows" those extended properties