[wp-trac] [WordPress Trac] #51065: Upgrade to WP 5.5 breaks hamburger menu on mobile

[WordPress Trac]

#51065: Upgrade to WP 5.5 breaks hamburger menu on mobile
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 Reporter:  chabekah     |      Owner:  (none)
     Type:  defect       |     Status:  new
  (bug)                  |
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Menus        |    Version:  5.5
 Severity:  normal       |   Keywords:  responsive twenty_sixteen
  Focuses:  ui           |  navigation mobile
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 I updated to WP 5.5 from 5.4.2 yesterday and noticed a couple of odd
 things that I suspect are related:

 1. On a desktop, there is single upward motion animation over the header
 menu at the top of the page on page load that is new.
 2. On a small screen, the hamburger menu briefly appears on the top right
 corner of the page, and then shrinks very quickly. It cannot be clicked -
 which prevents users on small screens from accessing the navigation and
 menu on the site.

 As I upgraded a number of plugins at the same time as I did the 5.5
 upgrade, I wasn't sure whether it was a plugin upgrade that had caused the
 issue. Rolling back all the plugins but remaining on WP 5.5 did not solve
 the issue. But then rolling back to 5.4.2 resolved it. Upgrading back
 again to 5.5 resulted in the same broken behaviour.

 The website is currently running WP 5.5 and can be found at
 https://info.qurangateway.org/. The site uses a custom theme based on
 twenty_sixteen. It is likely that my theme is incompatible with WP 5.5 -
 but I would like to know what the problem is so that I can fix it,
 otherwise I will have to rollback to 5.4.2 and stay there which is not
 ideal.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51065>
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