I have copied your setup and I could replicate this issue (disappearing legend). I just fixed this and I will push the update ASAP for you! Thank you for reporting this.
EDIT: Update 6.4.0 is live!
I have copied your setup and I could replicate this issue (disappearing legend). I just fixed this and I will push the update ASAP for you! Thank you for reporting this.
EDIT: Update 6.4.0 is live!