Thanne. The answer to your original question is no.
"Creation: A creation spell manipulates matter to create an object or creature in the place the spellcaster designates (subject to the limits noted above). If the spell has a duration other than instantaneous, magic holds the creation together, and when the spell ends, the conjured creature or object vanishes without a trace.
If the spell has an instantaneous duration, the created object or creature is merely assembled through magic. It lasts indefinitely and does not depend on magic for its existence."
This does not state that the result of
all conjuration creation spells with an instantaneous duration lasts indefinitely. It states that
objects or creatures created with an instantaneous duration lasts indefinitely.
Acid, Cold, Electricity, Fire, Force, and Sound are effects (or energy) in the game, they are not objects (nor are they creatures).
DMG page 302 has an entire section on "Acid Effects".
DMG page 295 talks about "force effects" on incorporeal creatures, not "force objects".
PHB page 165: Acid, fire, cold, electricity and sonic are listed under the "Energy Attacks" section, not the "Object Attacks" section.
None of the Orbs are objects in the game. None of them have hit points.
PHB page 165
"Hit Points: An object's hit point total depends on what it is made of and how big it is. When an object's hit point total reaches zero, it's ruined."
In order for the Instantaneous Conjuration Creation Indefinite rule to take precedence, you have to prove that Acid, Cold, Electricity, Fire, Force, and Sound are objects (or creatures). If they are not objects or creatures, that sentence does not apply to them. Just because it is in the Conjuration Creation section does not mean that it applies to all Conjuration Creation spells. It only applies to those it discusses.
Or to look at this another way:
What is a "globe of force"?
I've never heard of one. What is it?
What is a "globe of sound"?
What is a "globe of acid"?
I've never heard of any of these as normal creations.
So, they must be magical creations. If they are magical creations, then Antimagic Field can affect them. In fact, these make sense as magical creations. They do not make sense at all as normal creations. If they are normal creations, they would immediately obey the normal "laws of game physics". For example, Electricity would ground itself, Fire would dissipate as it travels through the air, Sound would make a big noise at the location it is started at, etc.
So, these by definition must be magical. Sound does not move 40 feat in one direction only and damage objects or creatures. Sound emanates from its starting location. Force effects in the game are always magical.
Granted, Antimagic Field does not affect all magical creations (like Golems), but Orbs are not called out in the Antimagic Field spell as exceptions. If they are not called out as exceptions, they are not.
A few final points on this:
1) Game Balance: Allowing damaging spells to bypass Antimagic Field defeats the purpose of AMF. ONLY the magic stated within the AMF spell itself can and should actually bypass it. Period. Orbs and Acid Arrows are not mentioned in the spell.
2) We all know what should happen with an Orb and an Antimagic Field. Trying to squeeze out a bypass rule out of
If the spell has an instantaneous duration, the created object or creature is merely assembled through magic. It lasts indefinitely and does not depend on magic for its existence. is a bit of sophistry, especially since we all know they screwed up and gave Evocation spells to Conjurers.
Yet again, another non-core book comes up with the Bigger, Better, Badder syndrome.
