All methods inside RedisDatabase.cs which call ExecuteAsync with parameter 'T defaultValue' (eg StreamReadGroupAsync) does not work with transactions since there is no override ExecuteAsync with parameter 'T defaultValue' in RedisTransaction.cs and as a result ExecuteAsync of RedisBase.cs is used instead of RedisTransaction.cs

FYI: I downloaded the code and managed it to work by adding the overriden methods shown in the attached screenshot.