Created attachment 58544 [details] Error state from montara I've seen this failure mode twice now on gen2 and gen3, so recording for posterity. (Note this is -next+unbound, so the bug may be all mine.)
On a second look, that's a tiling artifact.
I've not reproduced this having applied the fenced untiled BLT path, so considering this a dupe. *** This bug has been marked as a duplicate of bug 43427 ***
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