Header (Bar - Container) Flex Basis Issue + Bonus Refreshing Issue

Trying to set flex basis changes flex-shrink value (upper input field).

www.loom.com/share/c06e51241f8747e9a65d48873f1a81d2

Refreshing Issue:

Refreshing Header not showing containers. It show only after clicking on any container and after clicking"Layout"

www.loom.com/share/7c22c29bea574c89858bbf6b93370fda

Thanks! Flex basis issue is fixed. Confirmed on the containers missing.

Fixed in beta6.