Hong Kong’s de facto central bank has accused State Street Global Advisors of creating “market uncertainties” with the sudden reversal of its decision to stop investing in Chinese companies on the US sanctions list via Hong Kong’s largest exchange traded fund.

State Street announced last week that its Tracker Fund of Hong Kong would continue investing in blacklisted Chinese companies, just two days after it had announced it would not, prompting widespread criticism including from the Hong Kong Monetary Authority.

The Boston-based company, which had attracted criticism and calls to remove it as the Tracker Fund’s manager, said in a disclosure to the local stock exchange that it had decided to change tack and resume investing in the blacklisted companies in order to meet the fund’s objective to “closely correspond” to the Hang Seng index. It had previously warned that investors might see significant a tracking error.