Chimney breast with large hollow plasterboard sections?

[Tedds23]

New member here so please be gentle

We moved into our current house last October. The chimney breast in the living room appears to have two large hollow sections that are made of plasterboard. I have highlighted these sections in red.

Is this normal?

There is another chimney breast in the bedroom directly above it that has the same width but that is made entirely of brick. Is this considered to be properly supported is the breast below it is effectively a lot narrower? Thank you

 

[footprints]

Not normal my guess is the plaster was bad and repaired with plasterboard fixed with dot and dab.

 

[Tedds23]

Hey footprints, thanks for the reply. Does dot and dab plasterboard sound hollow when you tap it? Thanks

 

[footprints]

Hollow, other than where the dabs of adhesive are.