Losing access to editor when switching theme

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Silverstripe Version: 4.5

**Question: Losing access to editor when switching theme **

New installation, even newer user of Silverstripe;
Losing the ability to access the editor with [URL]/admin after switching theme from “SIMPLE” (default) to theme created from scratch after switching in ‘theme.yml’. Switching back to ‘SIMPLE’ brings back the editor.
Did anyone else have this problem?

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