How can I prevent the new indexing bug from creating useless pages on Google?

Moving to a new domain gets rid of the 404s, something that Shopify has spent an entire quarter failing at. Every single solution that’s been applied in the last 3 months failed. Can you really blame us for looking at other solutions? We’ve had to cut our employees hours because of this and Shopify has been completely opaque, and every “fix” has generated another issue. Saying that the 404s aren’t to blame makes this more like a cover-up than a solution. We need a date on when to expect that document, even if it’s “within a month” or something vague.