Tooltip does not appear

If I use the plugin with a specific workbook IntelliSense does not work. I tried a lot, but it did not work.

I created a minimum test file. In this test file with 2 functions (like your example) it works just fine. I opened my main workbook and tried to find the difference but there is none. But if I switch to the main XLSM file and type again the function in a cell the tooltip suddenly works.

I have absolutely no clue what the problem is. My Excel file size is 551 KB and I have 25 sheets (including _IntelliSense_).

Is there a known issue with the file size or sheet count?