Why live trendbar has no closeprice

A live trendbar doesn't have deltaClose
the close in this case is the current bid and ask

You can think about it like this:

Because it's a live candle, the close keeps changing

Once you subscribe to SpotEvent (which you obviously did cuz server throws error if you didnt) you get current bid ask values, use those as close

in the picture, each row is a server message, so the red box is your close price

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trendbar field is 1M candle of last minute without close (only has open,high,low)

bid/ask fields are the last known price and they are the hypothetical/perpetual close for the trendbar candle

a somewhat👇 similar (but not identical) conversation