Bitbucket logo issues

[Former user]

After upgrading our Bitbucket server application to 7.14.0 we noticed issues with the Bitbucket logo. See screenshot. We run version 1.2.1 of the look and feel plugin but cannot select this version on this form. The issue occurs when we change the header color to #fdcd00 but it doesn't occur every header color, #cc0000 is no issue for example.