Jack Ma¡¯s minute-long video appearance last week gave Alibaba Group Holding Ltd. a much-needed reprieve after months of speculation over the extent to which Beijing will pursue China¡¯s largest online retailer.

But that tonic didn¡¯t last long, as investors returned to grappling with the same questions that had already wiped $150 billion off the firm¡¯s market value.

On Tuesday, Alibaba is projected to unveil its slowest pace of third-quarter sales growth in five years while it confronts potentially the biggest crisis of its two-decade existence.