Created attachment 136400 [details]
Illustration of the problem presented.

There is a problem with the features approved with the displayed hints.
In the Polish version of CALC, the function names also contain the letters of the Polish alphabet and have the following structure:
Name [.name1 [.name2 [...]]]
When typing a function name, a prompt appears to prompt you to select a function and press ENTER to confirm it.
When entering function names by capitalize  there is no problem with approving the selected function.
When function names are typed in lowercase letters and one of the letters in the "Name" is entered in the Polish alphabet, then the selection of the predictive function gives the correct effect only if the selected function has only a part „Name”. When a function name is selected, it consists of at least one "name1" element the effect is to insert a distorted function name in which the letter of the Polish alphabet is replaced by a Latin equivalent. However, the function name is treated as plain text.

The illustration shows the Polish equivalents of the IF, IFERROR and IFNA functions after the lowercase letter "ż" has been entered. The name in green will be entered correctly. Name marked in red - wrong.
If the entry would start with only the letters "je", each function name would be inserted correctly.