Instead of spamming the Reddit because you lost your gems visit the link below and fill out the details.
https://mtgarena-support.wizards.com/hc/en-us/requests/new?ticket_form_id=360000317092
I’m sure they are aware of bugs and will be handling requests as quick as they can.
Yes it sucks to lose gems, but have some faith on the first day of a set release!
Edit: you can also wait for the fix wizards is implementing. It sounds like some sort of roll back/ resolution will be taking place. Be patient, we are all excited for this set.
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