Unexpected empty event when fetching events on block 703071.

[AlexZhenWang]

Hi guys, I got an empty event when fetching events on block 703071.

After calling await this.api.query.system.events.at(blockHash).toPromise(),
I got:
'[{"phase":{"ApplyExtrinsic":0},"event":{"index":"0x0000","data":[{"weight":10000,"class":"Operational","paysFee":true}]},"topics":[]}, {"phase":{"ApplyExtrinsic":1},"event":{"index":"0x0000","data":[{"weight":10000,"class":"Normal","paysFee":true}]},"topics":[]}, {"phase":{"ApplyExtrinsic":2},"event":{"index":"0x0303","data":[2,{"symbol":"0xd373896af0d70b40c8b80af075f2761043c1a63798a2c5cb95d68f1d66bd2f0000000040228a097ac4865aa84c3b4b0000020000000000102700000001","decimalPlaces":0}]},"topics":[]}, {"phase":{"ApplyExtrinsic":0},"event":{"index":"0x0000","data":null},"topics":[]}]'

The last even here is an empty event but seems like there shouldn't be an empty event in this block.

[jordy25519]

Could be related to AssetInfoUpdated event/tx

[AlexZhenWang]

Could be related to AssetInfoUpdated event/tx

Thanks for checking!
Yeah, exactly, the index of the third event is 0x0303- GenericAsset AssetInfoUpdated. Also, just share what I see, I see the Compact.decodeU8a() returns length 4 when decoding event, but the u8a are all used after decoding the first 3 events.

[wilfred-centrality]

@Holygits let's prioritise this between the transition UI launch and the transition processing event, as it's needed for the block explorer @AlexZhenWang is working on.

[AlexZhenWang]

Thank you 🙌 @wilfred-centrality !

[aliXsed]

@KarishmaBothara This is likely to be caused by the fact that we haven't added our cennznet custom events (here AssetInfoUpdated) to metadata. But it's not just that. We have events in CENNZx for AddLiquidity for example that are not covered in the metadata. So when adding this, it would be good if you add all the others as well.

[jordy25519]

support this will be in the next release, closed via #186