Hey @Min_Liu and @muchisx - thanks for flagging this.
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It looks like this may be clearing up now based on the related managed pricing thread here (a similar issue, but not quite the same): Managed Billing down for some stores - #11 by Alan_G
I want to double-check before calling it resolved though, since dev-store test charges are important for testing plan flows. If you’re still seeing regular charges instead of test subscriptions on development stores, could you share the app ID/app URL, dev store domain or shop ID, and the plan you’re trying to select?
If this is working again on your end now, a quick confirmation here would be super helpful too. Let me know if I can set up a DM if you’d rather not share those details publicly.
EDIT: Hiding my original post here since it has some incorrect info (mixed up this issue with another and shared some out of date info - see second reply for correct up-to-date comment, thanks!) Keeping for posterity though 