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i had the same problem and as i remember the problem was the wysiwyg editor. try another one. Paste the code in block and click savve and close but don’t open the block again.
i had the same problem and as i remember the problem was the wysiwyg editor. try another one. Paste the code in block and click savve and close but don't open the block again.
As alternative try to switch WYSIWYG editor to the source code mode