Transient failure in spec/features/projects/tree/upload_file_spec.rb

As seen in https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/61167712:

  1) Multi-file editor upload file uploads image file
     Failure/Error: expect(page).not_to have_selector('.monaco-editor')
       expected not to find visible css ".monaco-editor", found 1 match: "1 iVBORw0KGgoAAAANSUhEUgAAAcwAAAFCBAMAAACOT/AdAAAAFVBMVEX////31rX31r WtEACtEAD///8AAADfvh9HAAAABHRSTlMAQP/1nfoQuwAAA7xJREFUeAHt3YmRm0AQ RmE5gx1FYEhhyABScAqbfwiu8UGXxmP93mahra736tiTWn1qH11g4dvz7vMfvd18LZ tqvQUEEyZMmDBhwoRplT1jbi0ns7Y0c62t0Bkas7SEVQ4yfqSC+TOYMGHChAkzMdOx +3QuvQqpBWje62Dz3iWr0H1M0quQHuQHmDbSeObPYMKECfNoMPkL5acwAbO3bg9Vxw Ikn0WxCgUwV+cgNbMbKUyYMGHChJmAWV +SWVv6DJD15lyAvu2NPuxWobL3SUx7REeYX8rvukH6mHbs9H8x7QiYMGEeCCbM0srP NOFrMrvmLhfzZx3zvTW33lsdc3DYVFrBTFuAzmCaNZhpg/QxYcKECRNmeSwrs3elYl pVn/epgqmLZ6762LXkZw4gMGHChJmKCROmfv2W/aSv9WmLJh15ErpXkHnPCm1Ps5 +kO5FpeecKEyZMmDBhwvQzXUJ9kU8kDuu2z7KXmOm48AkTJkyYIpgwRTDddQ/V2lrO z42Y3T6UlalXXJj +YMKECROmvlSUmWl9NtMe72b5PjdiilNDqZh6xYXpDyZMmDBh6lUoCfPikR5e9oZCv Q+lZ26X/QaFCRMmTJgw696Smann6rA+qkWzJYRyFUrP1COFCRMmTJgwVY6rZOmZeqR +tWzT6e9bYcL0BBMmTJgwHaeGEjDFXANSQpgwYQYEEyZMmGIfysUMnateBWHChAkTJ kyYkUy9CkUz/f9FqWOkc2v0noAI0gWDhAkTJkyYMGH6V6F4pn8B8o50ZNAPf7zJHR8 kTJgwYcKECROmfwGSTL3ifZwZN0iYMGHChAkTZgLmWh +LZW4tz7IXMD6YMGHChAlTBxPmvXu8eomTT8I4/x2jUzDtsAkmTJgwYcKEGc0srcX3 MjVN10L/PuQdZADzgrnChAkTJkyYMP0LUMAdkfy3jfYNMoCpc4wUJkyYMGHChBmyAI 2 +oK8XhjBtkDBhwoQJEyZMmHoB0lZ1f4D4ZU8OEiZMmDqYMGHChKl3Ov19MGHChAkTJ sy8zLW2Sqt7768fLqHMy +5J4GTak5qZaa0wYcKECRNmFNO/l7j/rq6DluNMnZN5zj0I9MZX9jIzrQkmTJgwYcK MZwbczVmvQiHMa2/HZNnnbB9KzbRgwoQJEybMeKZegF6EaRfl7vsh+h84TSffjkm7 +v753OUMEyZMmDBhwnw1ZhlUW+Vp8nLfACKfUM2MSgwSJkyYMGGeEEyY +spMZHoB0iUYJEyYMGHChAlTXyAqH+5GdHLfAQoWawTjHNSuAAAAAElFTkSuQmCC". Also found "", which matched the selector but not all filters.
     # ./spec/features/projects/tree/upload_file_spec.rb:49:in `block (2 levels) in <top (required)>'

Finished in 26 minutes 33 seconds (files took 38 seconds to load)
1202 examples, 1 failure, 7 pending

Failed examples:

rspec ./spec/features/projects/tree/upload_file_spec.rb:39 # Multi-file editor upload file uploads image file