I can confirm that the issue does not occur with FreebSD 12.1, FPC 3.3.1 snapshot from June 2019 and Lazarus 2.0.6 or 2.1.0 (trunk) using the GTK2 widget set.
[EDIT]
Lazarus v2.1.0 r61574 with GTK2 widget set, FPC v3.0.4, Ubuntu 18.04 is also OK.
[/EDIT]