Merge Request stuck in "You can only merge once the items above are resolved" after approval

Summary

MR Have been approved by the required number of approvers but the Merge button is still grayed out and stuck at

You can only merge once the items above are resolved

There are no other items to resolve on this MR

Example

https://gitlab.com/mintel/satoshi/infrastructure/terragrunt-satoshi-services-infrastructure/merge_requests/29

What is the current bug behavior?

MERGE button is grayed out

What is the expected correct behavior?

Merge is available

Results of GitLab environment info

Gitlab.com

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