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I was conducting some research (https://themes.artbees.net/blog/custom-menu-items-limit-in-wordpress/) into the issue and I found that we might be at the menu’s limit. I’m close to 100 menu items.
Hmmmm… tell me what to change – https://www.screencast.com/t/99O9ChZI8c8V
(I changed the max_input_vars from 1000 to 2000. It didn’t work out. So, I changed it back.)
Issue resolved. Server setting issues.