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204
204 of the 500 most downloaded mods on Modrinth don't list Minecraft 26.3. Checked 2026-11-04. Most downloaded first, with the newest release each lists and the date of its last file.
This is what the mod's author listed on Modrinth, not a test. A listing doesn't prove a mod runs on your setup, and a missing listing doesn't prove it fails. Versions must match exactly, and files published elsewhere, such as CurseForge, aren't counted. Some of these may never move to 26.3: their authors may have stopped, or replaced them.