Do you see some errors or warnings about theme in logs?
tutor dev logs --follow --tail=40
On this week I am worked on my private mfe authn fork and when mounting it getting not working themes and errors in log, but this repo was messed and not runs properly. When I mounting correct repo theme loads without problem.
Installed tutor[full] in clean env, themes switches with tutor dev do settheme default and tutor dev do settheme indigo without problem. But it hard to see difference:
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Indigo theme
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and Default theme
