Description: When I type "Monday" for example: after pressing the 'n' (after 'M' and 'o'), the word "Moday" is put in my document: * it is completed immediately (without pressing the "Accept key" like tab or enter) * it is spelled incorrectly; one letter is missing. Steps to Reproduce: 1. Disable "Show as tip" (menu Tools - AutoCorrect - AutoCorrect Options - tab Word Completion). 2. Start typing a word that is in the list of "Collected Words". Actual Results: When the third letter is pressed, the word is completed / pasted in the document - without the third letter. Expected Results: The word in the "Collected Words" that matches the typed prefix, is shown as suggestion and is only pasted when the "Accept with" key (defined in the same menu as mentioned above) is pressed. Reproducible: Always User Profile Reset: Yes Additional Info: This behaviour happens also with names of days and months, which are not in the list with "Collected Words". This behaviour does not happen when "Show as tip" in enabled. It happens in Windows 10 an Xubuntu 21.04 (clean installation/test usb drive)
After upgrading gtk3 as suggested here https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1925379, the problem was solved. So it is not a LO bug.
It appeared to be a GTK3 bug.