As of 2:30pm GMT+7 27th of October 2021. All feeds are being processed again. And the issues are resolved.
As of the 23rd of October, all static files such as XML, Text Delimited, Google Sheets are not getting processed in Google Merchant Center.
If you are using Content API, then you should not experience any issues.
I have contacted our community managers and will update this post once the issues have been resolved.
There is currently no workaround to resolve the issue.