asx data
For the past few days (since 28-May?) most ASX data seems to be missing (returns zero values) after midnight (Australia time). After the start of trading data returns. It looks like it is related to last price or closing price.
Example
44th
ranked

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Peter Edwards commented
Looks to be corrected for most stocks, but still some hybrids; WBCPE, CBAPC show zero values