I'm seeing an odd thing in the Zotero 5.0 beta, running on Ubuntu 16.04, and I want to make sure it's a problem in LO or the US and not the client. Steps to reproduce (on my system):

(1) Run Zotero 5.0 client
(2) Open a document in LibreOffice
(3) Insert a reference with Quick menu
(4) Click to edit the reference details (before or after completing the insert)
(5) Move the cursor to the Suffix field and type "T" or "S" (as a capital letter)

Expected behavior: Inserts "T" or "S" into the Suffix field

Actual behavior (here, at least): Citation details menu closes immediately and the "T" or "S" is entered into the lookup box immediately after the current item

It seems likely to be a non-Zotero problem in my environment, but I'd like to be sure before chasing after the cause.