I am using boto3 to put data in Kinesis data stream. The code is running successfully and returns response with 200 status. But when I check the data in AWS console, am not able to see the recently added data with TRIM_HORIZON configuration.

Only if I specify the Starting position as At sequence number, I am able to see this data.

My question is, TRIM_HORIZON shows all the data from the start. Then why is it not showing the newly added data?