With Minecraft 1.21 less than a week away from its release, developers at Mojang Studios are preparing the game for an exciting update. Even though the update is going to release on June 13, there are still some pending bug fixes that are being addressed in pre-releases.Minecraft 1.21 pre-release 4 brings an interesting small change to how Blast and Fire Protection work. Previously, the effects of these enchantments didn't stack properly, and players could get away with enchanting only one piece of armor with Blast/Fire Protection. With pre-release 4, this issue has been fixed. Players will now have to wear a complete enchanted set to get the full benefit; otherwise, the damage reduction will be lowered.Other than this change, Minecraft 1.21 pre-release 4 has quite a few bug fixes related to the Wind Charge and Wind Burst enchantments. A bug that allowed a mace to have the Sharpness enchantment was also fixed in this release. Here are the official patch notes for Minecraft 1.21 pre-release 4.Minecraft 1.21 pre-release 4 patch notesChangesThe "Burning Time" reduction effect of Fire Protection and "Knockback Resistance" effect of Blast Protection now stack from wearing several piecesTo get the maximum benefit of these effects, you now need to wear a full set of enchanted armorWearing a fully enchanted armor set still grants the same effect as in 1.20.6Wearing only a single piece of enchanted armor now has reduced effect compared to beforeAfter a Primed TNT has gone through a Nether Portal, it will no longer be able to destroy Nether Portal blocksFixed bugs in 1.21 pre-release 4MC-270540 - The prevention of fall damage from wind charges is not retained upon reloading the worldMC-271971 - Wind Charges sometimes don't prevent fall damageMC-272933 - Fire protection burning time reduction now stacks for every piece of armorMC-272935 - Blast protection explosion knockback resistance now stacks for every piece of armorMC-272947 - Boat clutching after using a wind charge results in the player taking fall damageMC-272948 - Wind Burst damages the player twice on one use, even when using Wind ChargesMC-272981 - Using a wind charge to stop the fall damage after using the wind burst enchantment doesn't correctly cancel the damageMC-272982 - Mace can have sharpnessOverall, Minecraft 1.21 pre-release 4 is a small patch. This shouldn't be surprising as the Tricky Trials update is nearing its release. With Minecraft 1.21 release date on the horizon, Mojang is probably focusing on minor fixes and optimizations.