'hide images' feature not working correctly on safari

[vivacenontroppo]

steps to reproduce:

• open any tree on Safari (12.0.3 Desktop)
• click 'hide images'
  result: probably images will hide
• click 'hide images' again
  result: images won't show
  expected: images showed
• click on any other option on the list
  result: images showed (+ other option action)

In general, if you try to click a few times on this you'll get it. It works only one time and then you have to change something else to make it work again.

macOS Mojave