--optimise build shows displaced text in menu

Description

1. build with --optimise
2. load homepage

The culprit seems to be the display: -webkit-box attribute (pictured)
Not in release.

Environment

None

Assignee

Kathryn Gough

Reporter

Damian Jansen

Labels

Tested Version/s

None

Components

Sprint

None

Affects versions

Priority

unspecified
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