Not able to update or add group variables in gitlab

We have a group created in gitlab inside which our all projects resides. On the group level we have specified lots of common variables which are used in multiple projects inside. After gitlab’s recent update, we are not able to update or add new group variable under this group. We get [“Name can contain only letters, digits, emojis, ‘’, ‘.’, dash, space. It must start with letter, digit, emoji or '’.”] this error message. Earlier this functionality was working, we started facing issues when gitlab version updated.

Also, if I go any other group inside the parent group, I am able to add new variable in it. Only the issue is with parent group, where I get 400 in patch requests to update variables.

Has anyone faced this kind of issue?