Endermen are agrovated by Enderdragon

Endermen began swarming directly wherever the ender dragon was flying. When he came to land on the Bedrock exit portal they were getting in my way i kept accidentally hitting them. just to make sure it was a bug i left and re-entered the end multiple times with the same result. Not sure if this is intentional but this definitely didn't happen in 1.15.2 as i fought the Enderdragon last week and this didn't happen.