Add a block data tag to add all shulkers to the minecraft:blocks/shulker_boxes tag

In vanilla this tag is used to prevent walls, fences, etc to connect to shulker boxes. As it is Reinforced Shulkers go against this behaviour. A similar mod, Iron Shulker Boxes add this tag.

Currently, I am adding an item to my mod SurvivalPlus which uses shulkers and detects valid shulkers using this tag, so right now it's not detecting any shulkers from this mod.

Thank you for your report. It will be fixed in v2.5.3+1.20.4.