Right directional lights but does not flash

1998 Plymouth Voyager. No accidents, no damage, rust or prior electrical problems. Car is in otherwise excellent condition.

Left directional and emergency flasher 100% fine.
Right directional front rear and dash indicator flash only once then stops unlit.
If I turn on hazard flasher none of the lights on the right flash or light at all.
If I then try the right directional it does not flash once. After a while it will flash once again.
As a cheap precaution I changed front and rear bulbs. No change.
I unplugged and reseated the directional and hazard relays. No change.
I assume it is not the multi-function switch since it lights for the first flash.
I always understood the directional relay is the same for both sides. Can it be marginal and the increased wire resistance to the right side is enough to make it fail?