When using a b-form-group element with a label, clicking on the label/legend causes the first element in the group body to be focused. This implicit behavior is not desired in some cases and it should either be disabled or an explicit property should be added to either disable or enable this behavior.

Fiddle demonstration: https://jsfiddle.net/satkunas/ezu3r9gx/8/

RHEL 64-bit (3.10.0-862.9.1.el7.x86_64),
Chromium Version 69.0.3497.100 (Official Build) (64-bit),
bootstrap 4.1.3
bootstrap-vue 2.0.0-rc.11