Same issue here since the beginning. (ordered on day 1) I had timelapse active for quite some time, then disabled it. Didn’t change anything. I would make sense it pauses to create the end photo / timelapse – but that would be a very dumb design imho. 
I rarely watch the end of a print, so I’m not sure how often it happens. But yesterday I’ve got a blob again.
There was another thread about this issue:
https://forum.bambulab.com/t/problem-with-end-of-print/210002