Protobuf parser reporting extra `JsonToken.END_OBJECT` at end

[cowtowncoder]

(note: issue uncovered due to FasterXML/jackson-databind#3406 change to default of DeserializationFeature.FAIL_ON_TRAILING_TOKENS to true).

When Protobuf mapper reads content and DeserializationFeature.FAIL_ON_TRAILING_TOKENS is enabled, there is at least one extra JsonToken.END_OBJECT reported after root-level Object.
This should not happen.

[cowtowncoder]

Interesting: seems to only occur on 3.0; 2.19 not affected.

Further it looks like Arrays are somehow related (and in particular, sparse Arrays?).