It looks like the field is either set to required and hidden in the field configuration, or is set to required via a workflow validator but missing from the screen or again hidden.
Check the Create screen to first verify the field is present on the screen, then look at the field configuration to make sure the field is shown and not set to hidden. Then check the create issue transition for a validator for the field.
The following Articles will help narrow this down on what to look for:
Let me know what you find.
It seems like Original Estimate is either in the Workflow or the Screen Configuration set as required...
You might want to add them to the create issue screen for the Bug issue type in this project.
As admin go to the project configuration and go to Screens, there you should see some screen assigned to Bug issue type.
Open the screen and configure it, add the needed fields such as Original Estimate.
Here is the whole documentation for the so calles Screen Schemes. https://confluence.atlassian.com/adminjiracloud/associating-a-screen-with-an-issue-operation-776636488.html
By the way, when you click Configure field in the upper corner, there should be something like "Wheres my Field?" it might tell you why the field is not showing up.
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