The "Add... Predecessor" option in the context menu is sometimes incorrectly disabled (or incorrectly enabled). It appears that the disabled state is not reset from the last time the context menu was opened.
To repro:
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Right click "Website design" task to open the context menu
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Note that "Add... Predecessor" is enabled
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Refresh the browser
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Right click "Launch SaaS Product" task to open the context menu and close it
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Right click "Website design" task to open the context menu
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Note that "Add... Predecessor" is disabled
It seems wrong that #3 and #7 are different outcomes, since I am editing the same task, the only difference is that I have opened the context menu on another task before it.