1) I installed Inkscape
2) As I had already upgraded the yaru packages by enabling -proposed to verify another fix I downgraded them to version 20.04.6
3) I verified that radio buttons looked like as described above
4) I upgraded the yaru packages again to version 20.04.7
5) I then saw that the radio buttons had changed as intended
To verify I took the following steps:
1) I installed Inkscape
2) As I had already upgraded the yaru packages by enabling -proposed to verify another fix I downgraded them to version 20.04.6
3) I verified that radio buttons looked like as described above
4) I upgraded the yaru packages again to version 20.04.7
5) I then saw that the radio buttons had changed as intended
So marking as verified