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Notices from [paypal] shortcode causes Gutenberg to report Updating failed #101
The following shortcode produces a Notice during expansion
Notice: Undefined index: amount in plugins\oik\shortcodes\oik-paypal.php on line 133
There are two things here:
For oik, we can only address the first part.
Correct the shortcode to add the missing
Long term solution
Implement the PayPal button as a block.