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Weird form submission failed error

  • There is a weird form submission failed error related to textarea HTML element in the OperaGX and it prevents me from posting any messages in a XenForo forum running XenForo 2.

    However IT doesn't happen on Chrome and other browsers, only OperaGX. I did not test with the normal Opera, though.

    The screenshot of the error is below:

    I got that screenshot when trying to post an update for one of my resources. However it happens on all areas, i.e sending message to a thread, sending response to a private message, posting an update for resource (picture), etc.

    Do note that the mentioned HTML element is clearly closed in both the view-source and the DevTools HTML tab, and it works on Chrome & other browsers, so I guess it is specific to Opera?

    Note: I tested on Chrome 87 and OperaGX has Chromium 86 as base, I don't think that will matter but anyway.

    If this and the other thread I opened about upgrading Chromium base to 87 would be fixed, my daily schedule would enchance a lot.

    I don't want to switch browsers when I need to post something because of this weird error, and Chromium 87 just has some security and performance fixes and it would be great.