Issues after mesa update

[fatpenguin]

Hi, first of all I apologize if this might not be the best place to post this issue. I am running Openbox and tint2, no DE, and using the latest 5.15 LTS kernel and linux-firmware. My GPU is an AMD Radeon Barcelo and my CPU is a Ryzen 7. After the latest mesa update (22.3.3) I have a lot of problems:
1) my Openbox menu has black borders around each entry;
2) my mouse pointer disappears when hovering on icons but reappears as soon as I right-click on the Desktop to open the Openbox menu. However, it's almost impossible to click anywhere because the pointer disappears again;
3) some app icons in the tint2 systray won't show anymore but if I right-click where they are supposed to be, the app menu shows up.

If I downgrade mesa to 22.3.2 the problem vanishes but I wouldn't really want to keep this version forever, since the updated version has a lot of bugfixes and I don't really know how long the old version would be compatible with future xorg updates and the like. I submitted the issue to the mesa gitlab but they don't have an answer.
How could I try to fix, or, at least, properly debug this? Thanks in advance.