EMI have problems showing tags. A lot of items are missing from tags showed, despite EMI clearly knowing these items are in certain tag, because if you do search by tag, all items properly show up.

This is simple example what items are missing in "#minecraft:dirt" tag.

Of course this is well, heavily modded modpack in sense of biome mods, but even on plain instance there are problems with minecraft stuff. For example tag "#minecraft:sniffer_diggable_block" isn't showing altogether. You can still search it with normal searching, but on standard tag tab this tag isn't showing up.

Version: neoforge 1.21.1

there are multiple kinds of tag. you're sure these missing items are in the #minecraft:dirt item tag and not just the block tag? EMI only shows item tags.

EMI is correctly showing item tags (which are used for recipes), but allows you to search block tags as a matter of convenience. There are some blocks that do not have items so displaying block tags as item tags can be tricky and confusing, this is all working as intended.