There seems to be a problem with your HTML parser in page settings > Custom Page <head> section. In my example screencap it's a simple klavyio tracking <script>, but the parser is complaining about && and < characters in the code and wouldn't let me save (though this script was already there, so it must've worked fine in the past).

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I fixed it for myself with a tiny rewrite, this is more of an FIY.

yeah, seems like the parsing is not taking the script content into account. I think you could add this as a custom html component, I believe the validation is slightly different there since we assume there will be more nested <script> tags

Cool, I had a problem with the "lass than" sign too

Yeah, it’s because < and & are special characters in html that the parser is getting tripped up on haha. That should be taken care of here too!