2.4 OVROverlayCanvas flickering issue

Tested on Quest 2/3/3S - OS v2.4.1034

After updating from 2.3 to 2.4 this morning my app is showing significant performance and visual issues.
Apart from the framerate drops, it causes a black flickering on the screen that is only visible internally in the headset (i.e, doesn't show up on cast or video recording). 
It seems to be related to the use of OVROverlayCanvas as I tested an older build from two weeks ago that didn't have it implemented yet and the issue is not present. It also seems to get worse when I open the oculus menu within the app, as if adding overlay layers worsened the issue.
Anyone else is seeing similar issues post-update ?