If you use the close button to close a preiew window, then directly hard pressing on a link won't open a preview window. Workaround is to click somewhere else first. Issue also doesn't happen if you scroll or click a place outside the preview window to close it.
I expect a preview wondow to open normally without any issues.
Version 0.99.127.1-rc (WebKit 619.1.1)
Sonoma (14)