Veltharis ap Rylix
Legend
Seems to be a 1e Manual of the Planes thing...No it turns out Limbo does have layers, 5 layers.
"As described by the Great Wheel cosmology, Limbo had five layers that were nearly indistinguishable from each other. The first four layers were named for the chief race or deity that were most often found there. The fifth layer was referred to as the layer of Lost Gods.[1]"
My source
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Limbo
The Ever-Changing Chaos of Limbo was an Outer plane in the Great Wheel cosmology model that embodied the chaotic neutral alignment.[10][6] The plane of Warrior's Rest in the World Tree cosmology was similar to Limbo in many ways but not quite as morphic.[11] The batrachi formed a realm in Limbo...forgottenrealms.fandom.com
2e's Planes of Chaos and 3e's Manual of the Planes both say only that, if any layers of Limbo exist, they aren't stable and don't play by any rules that layers on other planes follow, constantly forming out of the plane and remerging into the plane.
I expect they'd follow later descriptions of the plane, regardless of their current stance on the inclusion/exclusion of real world mythologies.