JSON Error Underscores

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Hi Everyone,

I've been wrestling with a regular but intermittent bug on a 5.7 install. The Apache errors seem to relate to:
/public_html/updates/concrete5.7.5.1_remote_updater/concrete/src/Utility/Service/Text.php(158): htmlspecialchars('PHP's json exte...', 3, 'APP_CHARSET', false)

'"core/app" is not a valid asset group handle'


There are others, but basically it seems to relate to the text helper (t). I saw in other posts this might relate to underscores in some way being affected.

Is anyone else experiencing this problem?

I believe I may have fixed it by removing the underscores from the update directory and changing accordingly in config. We'll see...

misterbethel