Elder guardian and guardian laser damage is affected by the potion of strength or weakness, even if it is a long-range attack

Confirmed.

I personally feel as if the problem here is that wardens' sonic boom attack isn't impacted by the strength or weakness effects (MC-251145). There is indeed an inconsistency here between guardians/elder guardians and wardens, and I know that MC-251145 was resolved as "Works As Intended", so if this ticket (MC-262596) follows a similar resolution, we should request a review of MC-251145.