ProductVariant optionIds must include one optionId from each of the groups

[zehawki]

Describe the bug
When saving an existing variant, I get the error: ProductVariant optionIds must include one optionId from each of the groups

To Reproduce
Steps to reproduce the behavior:

1. Fresh install, start the admin UI, loaded with default dataset
2. Under inventory, click on Modern chair /admin/catalog/inventory/54
3. Click on Manage Variants /admin/catalog/inventory/54/manage-variants
4. Create product option group
5. Assign new product option to existing product variant and save - then this error props up
6. Here's how it looks for me right now:

First I create a new option: Size. I assigned Size to the 3 existing variants, and saved - no issue.
Then I created another option: Type. I assigned Type to the 3 existing variants, and tried to save. When saving any row, I hit the error.
I deleted Type and created another option: Extras. I assigned Extra to an existing variants, and tried to save. When saving I hit the same error.
Then I went browser back to the inventory item page and then a browser forward. Then time save on the line item is successful.

Expected behavior
Should save the product variant without issue.

Environment (please complete the following information):

• @vendure/core version: v2.0.5
• Nodejs version:
• Database (mysql/postgres etc): Postgres