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
mukesh.singh
ashokkarale
Yoichi
Luis_Fernando
Anil_G
anjani_priya
MPAL
indiedev91
Stef_99
ayumi.ouchi