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DBLookupComboBox CloseUp

Lazarus/FPC Version: <2.20RC2> (Copy from Menu -> Help -> About Lazarus -> Button "Copy version information to clipboard")
Operating System: <Linux - Leap 15.3>
CPU / Bitness: <64 bit> (64 or 32 Bit?)

What happens

<If I build Lazarus with Qt Widget LCL and I use DBLookupComboBox object the signal "CloseUp" doesn't called at first time but at second it called two times. Up to version 1.8.4 it worked. From version 2.O not anymore. If I build Lazarus with Gtk2 Widget LCL instead all works>

What did you expect

<The signal "CloseUp" should be called on every close of the list even with the qt>

Steps to reproduce

<Build Lazarus with Qt Widget LCL; Insert and populate a DBLookupComboBox object (also with a "Items.Add") and activate a call in "CloseUp" event>