[next] Rotating polyobjects with jittering planes in Software

Most rotating polyobjects in CEZ2 have this issue as of current next, except the ones at the end of the level. This only happens in Software mode.

changed milestone to %2.2.10

added Regression label

mentioned in merge request !1533 (merged)

closed via merge request !1533 (merged)

mentioned in commit 113cedd4