I was wondering why not all menu-options where shown in the select-boxes, and I think I found the bug. On line 389 you can find the following code:
$options[$data['link']['href']] = $title;
However, the href-value is not necessarily unique and so the value might, and sometimes, will be overwritten.

The 5.x version used the menu-id instead of the href. So this might be a solution for the 6.x version as well.

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sun’s picture

sun
Primary language German
Location Karlsruhe
commented
Status: Active » Closed (duplicate)

Marking as duplicate of #440578: Selection of some menu items is not possible/available. You can follow up on that issue to track its status instead. If any information from this issue is missing in the other issue, please make sure you provide it over there.

However, thanks for taking the time to report this issue.