Setup a beacon in the real world, ie at 118/64/259. Activate one or two effect.

Go to the nether at the coordinate inside the the area of effect, ie at 118/any/259. In some case you will get the effect(s) of your beacon.

In order to validate the match with the beacon, I changed the power given by the beacon and come back in the nether : the effect also changed.

In order to get the effect rather each time, set up a portal in the nether within the area coordinates, then exit and enter back into the nether.

I've got the power each time i've entered the nether during writing this text (6 or 7 times).

When power was gain entering the nether, staying around the portal doing nothing make the power to dissapear after around 15-16 refreshments.

I didn't try anything to see if it works in the ender dimension.

I didn't find any open/working bug corresponding to this one, please pardon me if this is a duplicate.

By the way, I did add a comment on MC-48268, witch make me think both could be linked. Could it be something like : game think "the player is in the normal dimension", making both bug possible ? I guess it could also be totally different problems !

Hope it helps