Barrier/light particles are not visible if barrier/light item is in offhand

The issue with the light block is MC-221555 and the barrier is MC-83003.

As the barrier one is a recursion, I suggest reducing this to only the barrier, and linking it as "clones" instead.
Mojira mods won't reopen it and will request a new report be made anyways.

I can confirm that the issue reappeared for barriers.

Can confirm in 21w14a.

Can confirm in 21w15a.

Can confirm in 21w16a.

Can confirm in 21w17a.

Can confirm for 1.17 pre-release 3

Can see why you count this as a bug, as in previous versions barrier particles do appear when there is a barrier in your offhand.

Can confirm in 1.17.

Can confirm in 1.17.1.

I am able to confirm this behavior in 21w43a. Here are some extra details regarding this problem.

The Bug:

Barrier particles aren't visible when holding barriers in your offhand.

Steps to Reproduce:

• Place down a barrier and hold another one in your offhand.

• Make sure particles are set to anything other than "minimal" in your video settings as a result of MC-47607.

• Take note as to whether or not barrier particles are visible when holding barriers in your offhand.

Observed Behavior:

Barrier particles aren't visible when holding barriers in your offhand.

Expected Behavior:

Barrier particles would be visible when holding barriers in your offhand.

Can confirm in 1.18.1.

Can confirm in 1.19.

Can confirm in 1.19.2.

Also affects light blocks.

Affects 1.20.2

Code analysis:

Here inside getMarkerParticleTargets(), a 'Block' object is returned to check elsewhere for if the player for holding it. If the player is holding it, the barrier/particle is rendered. This check however only accounts for the mainhand due to "getMainHandItem()" being used.

Class: net\minecraft\client\multiplayer\ClientLevel.java - Method: getMarkerParticleTargets()

@Nullable
   private Block getMarkerParticleTarget() {
      if (this.minecraft.gameMode.getPlayerMode() == GameType.CREATIVE) {
         ItemStack itemstack = this.minecraft.player.getMainHandItem();
         Item item = itemstack.getItem();
         if (MARKER_PARTICLE_ITEMS.contains(item) && item instanceof BlockItem blockItem) {
            return blockItem.getBlock();
         }
      }
      return null;
   }