Only the server host needs this update (that is to say you do not need to ask the players to update) if you come from 0.4.61!
MYCONOID

• No longer has vision obstructing particles when devolving. Particles are instead visible to non spore myconoids only.
• Blocks that include moss or mushroom parts in their crafting recipes or names (like shroomlight) are now turf blocks.
• Hid bubbles from Moss UI. Added bubbles back to Crimson UI.
• Desert myconoid is no longer immune to heat damage (apparently being immune to cactus makes you immune to onFire, for whatever reason).
• Desert myconoid now gains water while inside a cactus.
• Desert myconoid now becomes undetectable (true invisibility + no collision) if it stops moving or sneaks for 3 seconds. Sneaking does not remove this effect. Dealing any damage to a creature will remove this effect.

REFRACTOR

• Refractor's netherite mirror now gives +0.5 trapped light per second on average (all forms) as opposed to just being a flex.
• Fixed a bug that caused Emerald Form to not show the oneshot protection indicator.
• Refractor can no longer swim and sinks like a rock when in water (they still drown in it).
• Refractor generates less trapped light when under water (equivalent to the new penalty of being in darkness).