Separate Bug Report created upon request of Moderator Auldrick.
This bug is indirectly related to MCPE-41803 through the action of the Ghast itself entering and being impaled by a lavafall, not related to the pathfinding of the Ghast itself.
On Windows 10 Custom Servers, and on all iterations (Platforms, Windows 10; Xbox One, PS4, etc.) of Bedrock Realms in Minecraft Bedrock Hotfix 1.16.201, when a Ghast enters a lavafall and becomes impaled and stuck, it creates a large amount of lag, negatively impacting the gameplay experience.
The lag creates issues in the area where this occurs, not limited to, but including:
All Nether Mobs moving unusually slow, and even at times coming to a halt for a short duration. This includes all of the following:
All Piglin variants (Piglins and Piglin Brutes)
Zombified Piglins
All skeleton variants (Wither and Regular)
Blazes
Magma Cubes of all sizes
All Hoglin variants (Hoglin and Zoglin)
Endermen
Other Ghasts who are not impaled by Lavafalls
Additionally, this lag negatively impacts the use of Tridents, where a Trident has to be held back ready to throw for 10-30 seconds before being thrown, as if just cocked back and thrown almost instantly as normal, it automatically returns to the player's inventory instead due to the lag.
Mining during this lag is spotty as well. Sometimes when mining blocks during this lag, they will disappear without dropping a block and then reappear seconds later.
Player movement is unaffected by this lag, and block placement is only affected by a delay in the block placing sound which occurs sometimes.
When the Ghast impaled in the lavafall is killed or removed from the lavafall, the lag dissipates and the gameplay returns to normal.
Steps to Reproduce:
Log onto a Realm on Minecraft Bedrock Edition Hotfix 1.16.201 on any platform or onto a custom server on Windows 10.
Enter the Nether and look for Ghasts around lavafalls and watch until one flies into a lavafall.
Try to use a Trident as normal to attempt to kill it, mine blocks, and observe other Nether Mobs while the Ghast is stuck in the lavafall.
Observed Results:
Extreme lag occurs until the Ghast stuck in the lavafall is killed or removed from the lavafall, causing negative effects on gameplay experience.
Expected Results:
No lag should be created when a Ghast is impaled and stuck in a lavafall. The game should function as normal as intended by the developer, where Tridents work as normal, mobs move as normal, and mining is normal.
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migrated
lizking10152011
Seems there was a removed comment stating that the bug tracker can't accept reports pertaining to third party servers. That is fine, but this still occurs on Minecraft Realms on Bedrock Edition with Hotfix 1.16.201
lizking10152011
Additionally, this bug may be similar to the bugs from 1.14 and 1.15 on Realms with Sea Turtles causing lag if they became stuck underwater on Magma Blocks (Which appeared it was patched in one of the 1.16 hotfixes), where it trying to escape may be causing the lag.
So maybe the impaled Ghast trying to move can be causing this lag.
lizking10152011
This issue seems to be fixed with the Bedrock 1.16.210 Hotfix. As per this hotfix, Ghasts entering lavafalls and being impaled no longer causes extreme lag on Realms or Custom Servers. Mining and throwing of tridents is no longer affected and movement of other mobs is no longer affected.
migrated
Occurs exactly as described on bedrock 1.18.31 and 1.18.32 on non-server android version. May have been happening earlier as well as was not going to nether for awhile. Game difficulty hard, at a bastion bordering nether wastes and crimson forest. Bug should be reopened.
Latest example is mining top of the one side of the tall rampart to find the 6 gold blocks in a treasure room bastion variant. Lava flow nearby drops from the ceiling. When the ghast gets stuck in it the severe lag starts. You don't even have to be looking at the ghast. When the lag starts if you go to the edge of the rampart to look out you'll find a ghast stuck in lava.
See screenshot. Not sure why the lava fall ends mid air, maybe that is related. When the lag happens, try mining a block above you. The time it takes to fall to the ground is on the order of 10 seconds.
The only thing not laggy is your own movement speed. It is like time has slowed for all entities. In this state you can no longer shoot a bow or throw a trident.
GoldenHelmet
Reopened based on preceding comment and community reports.
I wonder if the ghast has to be targeting the player to trigger the lag?