[Goose]

I believe what you are seeing are not cluster bomblets but rather tungsten fragments from the warhead casing, which are designed to fragment out for anti-personnel effect in addition to the blast effect from the warhead explosive. The second warhead hit a part of the building without windows unlike the other two, so I think that's why you don't see the same dispersed effects, as those fragments were probably "caught" by the internal structure of the building.
The GMLRS missiles fired by HIMARS look similar but with even more of those dispersed dust particles because it also has 180,000 tungsten balls in the warhead.

Certainly a reasonable explanation. However at their request Ukraine has received some M30 GMLRS missiles that contain DPICM, i.e. "cluster munitions". It is also possible the missile was an M30A1 which has the 180,000 pre-formed tungsten fragments. Hard to know from the video. If the target is a building I would expect that at least some unitary HE would be used to collapse the structure. If you don't have any HE, you of course use what you have.

[Goose]

I believe what you are seeing are not cluster bomblets but rather tungsten fragments from the warhead casing, which are designed to fragment out for anti-personnel effect in addition to the blast effect from the warhead explosive. The second warhead hit a part of the building without windows unlike the other two, so I think that's why you don't see the same dispersed effects, as those fragments were probably "caught" by the internal structure of the building.
The GMLRS missiles fired by HIMARS look similar but with even more of those dispersed dust particles because it also has 180,000 tungsten balls in the warhead.

Certainly a reasonable explanation. However at their request Ukraine has received some M30 GMLRS missiles that contain DPICM, i.e. "cluster munitions". It is also possible the missile was an M30A1 which has the 180,000 pre-formed tungsten fragments. Hard to know from the video. If the target is a building I would expect that at least some unitary HE would be used to collapse the structure. If you don't have any HE, you of course use what you have.