Thanks to your donations, we were able to hire core developers to focus on solving Mac OS specific issues for QGIS. More than 30 MacOS QGIS users donated a little more than 3000 € for this bug fixing round.
After an effort of triage and testing, here is what has been achieved:
Unfortunately, some issues remain. Mainly, the text being rendered as outlines in PDF export (https://issues.qgis.org/issues/3975) remains for now. It might be fixed in a following effort.
Thanks to all donors who helped in this effort and to Denis Rouzaud as a core developer who spent a lot of time investigating and fixing these issues!