in the 5.4 fixes: https://github.com/bu-ist/bu-blocks/pull/256 the previous custom "link" component was breaking in the new version of WordPress. I replaced it temporarily by copying the link component from the Leadin block which displays in the sidebar.
A better fix would be to use the Link component in the toolbar like the default button block. (not the link "formatting" button on the Rich text field though)
in the 5.4 fixes: https://github.com/bu-ist/bu-blocks/pull/256 the previous custom "link" component was breaking in the new version of WordPress. I replaced it temporarily by copying the link component from the Leadin block which displays in the sidebar.
A better fix would be to use the Link component in the toolbar like the default button block. (not the link "formatting" button on the Rich text field though)