This is due to Plugin loading order.
If the EditorDebugTool plugin is loaded before *SourceCodeAccess( in exsample : VisualStudioSourceCodeAccess ) plugin is loaded, CanShowModulesTab() returns false and the button will not appear.
The unstable load order is caused by unstable results of the FindPluginsInDirectory().
Setting the LoadingPhase in the EditorDebugTools plugin descriptor to PostDefault works around the issue.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-168330 in the post.
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| Component | UE - Editor - Workflow Systems |
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| Affects Versions | 5.0 |
| Created | Oct 26, 2022 |
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| Updated | Jan 20, 2024 |