Updated: Apr 19, 2020
The comet C/2019 Y4 (Atlas) as often happens to these minor bodies of the solar system, in approaching the sun has not held up and its core is disintegrating, as announced with Atel#13620 (see image below) and confirmed with Atel#13622:
Atel#13620 - Quanzhi Ye (U. Maryland), Qicheng Zhang (Caltech)
However, it seems that (the conditional is mandatory) in some long-exposure shots taken with my main telescope in direct focus, the false nucleus appears "broken up" into smaller portions, placed on the axis of the dust tail:
C2019 Y4 Atlas - 20200408 UT 19:47:39
False nucleus of C2019 Y4 Atlas - 20200408 UT 19:47:39 (800x)
C2019 Y4 Atlas - 20200408 UT 20:39:08
False nucleus of C2019 Y4 Atlas - 20200408 UT 20:39:08 (800x)
C2019 Y4 Atlas - 20200408 UT 21:22:47
False nucleus of C2019 Y4 Atlas - 20200408 UT 21:22:47
Now, we will see if what is found will find effective confirmation from other observatories...
PS: The core fragmentation observed on 08/04 was recently confirmed by Zhong-Yi Lin (IANCU), Chih-Hao Hsia (MUST), Wing-Huen Ip (IANCU) from the Lulin observatory with Atel#13629.