Debugging this issue showed that the device wasn't classified as hub as the API returns it as KASAHUB instead of the expected TAPOHUB. Considering it's possible that either one are used I added the KASAHUB option.
Using the debugger I changed the value on the fly and everything worked out great, all sub devices were recognized perfectly fine.
Since the breaking changes in version > 4.0.3 it wasn't possible to add the children/sub devices of a hub (https://github.com/petretiandrea/home-assistant-tapo-p100/issues/773)
Debugging this issue showed that the device wasn't classified as hub as the API returns it as KASAHUB instead of the expected TAPOHUB. Considering it's possible that either one are used I added the KASAHUB option.
Using the debugger I changed the value on the fly and everything worked out great, all sub devices were recognized perfectly fine.