Unreachable menu item due to selection handle on iOS

I have integrated ProseMirror into a web application form, using a floating menu that pops up after selecting text. This works fine in desktop browser, but on iOS devices I get the following peculiarity.

This screenshot of an iPhone shows the problem:

After selecting text the menu pops up, but with a small selection the left handle bar overlaps the bold option, so the user is unable to click it (even way outside the bar). I already tried to move the popup up and make the icons larger, but touching the area still selects/moves the handle.

A menubar at the top of the text box is not a solution, as the handle will still overlap some option(s). Any ideas on this?