I am adding my own personal experiences with this issue to this thread. You will find an ocean biome with vast fields, rivers, and lakes (seed #: 06252022), a desert biome with a vast ocean (seed #: Thereoncewasashipthatputtosea), and a frozen ocean with an above sea level ocean structure (random seed). It would seem that the sea level is not at the right height and thus results in structures that would normally spawn on the sea bed above sea level.
An update: I have found above ground ocean monuments in the Cold Ocean biome. See attached images. Please reconsider calling this a resolved issue. Think of the poor drowned who spawn out of the water and immediately burst into flames. :c
Rhyj
I am adding my own personal experiences with this issue to this thread. You will find an ocean biome with vast fields, rivers, and lakes (seed #: 06252022), a desert biome with a vast ocean (seed #: Thereoncewasashipthatputtosea), and a frozen ocean with an above sea level ocean structure (random seed). It would seem that the sea level is not at the right height and thus results in structures that would normally spawn on the sea bed above sea level.