I'm marking this as major because it was removing my canonical_url tag and google was complaining.
Also the fix has been available for 3 years.
I have Big Pipe module installed so it's meta tag should be removed on AMP pages via line 47 of file amp.module. It doesn't happen as there is a mistake in the condition - it should be
if ($value[1] == 'big_pipe_detect_nojs')
instead of
if ($key == 'big_pipe_detect_nojs')
3.5
Code
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I'm marking this as major because it was removing my canonical_url tag and google was complaining.
Also the fix has been available for 3 years.