Hydratation of custom namespaces for ApiDOM doesn't work

[char0n]

When using low level minim api of namespace.fromRefract on AsyncApi or OpenApi namespace we get

     Error: Given value is not an object containing an element name
      at JSONSerialiser.deserialise (/home/char0n/Documents/GitHub/apidom/apidom/node_modules/minim/lib/serialisers/JSONSerialiser.js:49:13)
      at Namespace.fromRefract (/home/char0n/Documents/GitHub/apidom/apidom/node_modules/minim/lib/Namespace.js:165:28)
      at Context.<anonymous> (test/namespace.ts:15:17)
      at processImmediate (internal/timers.js:456:21)

It's also possible that Base namespace can be affected.