Description:
Error Message UI Error.


Steps to Reproduce:
1. On a Column add two values on two rows. Example: CellB1=1.1 & CellB2=1.2
2. On CellA1 create a "Data Validity", with a "Cell range" with Source = B1:B2
3. On CellA1 write "1." (number "1" and a Dot ".") and the hit Option+Down (On Mac, normally, it will display the list, can't remember how to do it on Windows) to pick an option. 
4. It will Display the Error Message with the message "Invalid value." and "OK". But at the same time you have the option to pick the correct option, if you do, it won't display it on the CellA1, but when you do hit "OK" on the Error Message it will display the option that you picked.
It is Just an UI error, but an Error is an Error, and it can lead to something else.

Actual Results:
It work as Almost it should.

Expected Results:
It should not display the Error Message


Reproducible: Always


User Profile Reset: No



Additional Info:
MacBook Pro (Retina, 13-inch, Late 2013)
MacOS Catalina: 10.15.7 (19H2)

LibreOffice
Version: 6.4.6.2
Build ID: 0ce51a4fd21bff07a5c061082cc82c5ed232f115
CPU threads: 4; OS: Mac OS X 10.15.7; UI render: GL; VCL: osx; 
Locale: en-US (en_US.UTF-8); UI-Language: en-US
Calc: threaded