Originally dopus5 code deal with os3 only icons. Lately BSZili add support of native icons on amigaos4 and aros. That done via USE_DRAWICONSTATE ifdefs. For morphos and os3 that code didn't works, and probably in about the same places need add png-icons related code, so png icons will be shown.
On attached files can be seen how looks like default dopus5 code on morphos/ambient (i.e. png icons didn't shown, and os4 ones showns wrong like it was before we add DRAWICONSTATE code in the os4 builds too), and how looks like when we just trying to use USE_DRAWICONSTATE for morphos builds (i.e. no icons shown at all).