Prerequisites (mark completed items with an [x]):

• I have checked that my issue type is not listed here https://github.com/woocommerce/woocommerce/issues/new/choose
• My issue is not a security issue, support request, bug report, enhancement or feature request (Please use the link above if it is).

Issue Description:

The category block field ( tree control ) is not wrapping the selected items when in non-readonly mode, this is causing some weird UI behaviour (see screenshot):

This also happens to the Attribute select field:
)

Acceptance criteria

• Selected items in Tree Control should correctly wrap