Spurious feature error bug

I’m currently seeing a bug where the Features menu at the bottom left shows me a red exclamation mark whenever I open a specific typeface. When I compile the features, the signal goes away. But when I save and reopen the typeface, it appears again.

I always thought that exclamation mark just means the features are not compiled.

Why would it revert back to being uncompiled upon reopening, though? And it doesn’t happen in all my typefaces.

it is supposed to compile it in opening the file. I have a look.

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