Stash content loss on progressing to Act 3 in Fate of the Vaal

Played a few hours at launch of the Druid/Fate of the Vaal league - came back 12th of April and played a bit more. Upon progressing to Act 3 (and checking my stash in the Sandswept Marsh pseudo-town area) I found that all my stash tabs were empty and had reset to the league-start layout (Numbers 1-38 or whatever, not in the folders & with names & affinities that I had set up.)

The stash had all my items when I started playing on the 12th of April. But not after progression.

Quest to find the Lightless Passage, and Renly's Tools also reset at the same time

This looks like a stash state sync issue triggered on zone or act transition. It might be that the server loaded a default stash template instead of the saved one after progressing. If possible, checking server logs around the Act 3 unlock could help confirm whether the stash data failed to load or got overwritten.