Welcome to our UiPath Forum! 
It looks like a bug! Could you maybe share with us the project or at least more details (as per this topic)?
The best way to do that would be to submit the bug via our Studio feedback feature, see here:
#FeatureBlog - 19.7 - Send feedback or report bugs directly from Studio
ashokkarale
Julian_Muhlbauer
SorenB
Jaeyoung_Jung
Jon_Smith
avolaunch
Anil_G
MOMOMOMO
dokumentor
naveen.s