We're now releasing pre-release 5 for Minecraft 1.18. This pre-release contains more bug fixes and a tweak to new cave generation under existing chunks.
Changes in 1.18 Pre-release 5
If there is any bedrock at height 0 in a chunk, new world generation will happen under any non-air block at height 0 in that chunk
Fixed Bugs in 1.18 Pre-release 5
MC-138118 Parrot wing texture is reversed on the bottom
MC-148422 Stripped dark oak log side texture is too bright
MC-150567 Dark oak log top texture bark ring not updated
MC-204901 Side texture for dirt paths hasn't been updated with the texture update
MC-221172 Warped and Crimson Stems use different top texture from Bedrock Edition
MC-222154 Cave vines can generate hanging on pointed dripstone
MC-222763 Armor stands use the old smooth stone slab texture
MC-225553 Oak and iron doors have a line in their textures
MC-226711 Carrot crop texture has an incorrect pixel
MC-227258 Flowering Azalea Leaves are in both #minecraft:mineable/hoe and #minecraft:mineable/axe tags, while regular Azalea Leaves (and all other leaves) are only in #minecraft:mineable/hoe
MC-228900 Cave vines can generate floating (Recurrence of MC-218817)
MC-229977 Breaking blocks with pistons on the east/west direction causes significant lag
MC-231272 Cave vines can sometimes generate hanging on cobwebs
MC-231818 You can no longer use the up or down arrow to navigate between servers in the multiplayer menu
MC-233883 The hide and show messages buttons in the social interactions menu display their hover text regardless of the position of the cursor
MC-234039 The back of wild axolotls are off-centered
MC-235567 Clusters of dripstone (stalagmites) tend to generate abnormally frequent with thickness "tip" on tall caves
MC-236723 The Floating Islands preset does not seem to be generating correctly
MC-237500 Azalea trees can generate on top of huge mushrooms, trees & bamboo