Merge blocks from projector broken with prosperity update

After the last update 1.210.012 b0, projected merge blocks don't stay on the projector grid while welded and just drops down before it is complete, so i can't weld a grid starting from merge block to merge block. Both blocks (on the projector and the projected grids are turned on and facing the way they are supposed to) The bug occurs on small and on big grids.

On older beta 1.209.024 b0 the merge blocks stick normally allowing for them to be welded.

I made a new clean vanilla save to test this, Used the ships from earth start, just added a merge block to them.

Attached are the save, the blueprint, and tho clips one of old behaviour (merge sticks) and the new bugged behaviour (merge drops). just turn on the welder on the ship, and watch 5-10 unfinished merge blocks fall down.

Since the game didn't crash i don't have a log of the save

This renders player made torpedoes useless. Before, a merge block could be placed onto a welded merge block and be the same grid (ready to detach). Now they are separate grids and it just floats away

As of the recent update merge blocks will not attach correctly when the merge block is attached to a sub grid and welded when the grid is at speed.

This mainly impacts missile launching systems as if a reprint system is added the merge blocks will not attach if the grid has any form of speed, the main issue with this is this bug can quickly crash servers as they can be maliciously used to "nuke them " by spawning hundreds of merge blocks in the world, it also can break a lot of players grids by clanging them out.

I have attached a file with the possible out come of this bug

Since the latest update, I have an issue with Merge Blocks in Survival mode.

When I try to attach a new Merge Block to an already existing Merge Block on a Small Grid, the newly placed Merge Block immediately falls to the ground before it is even built. It behaves like a separate physics object instead of staying attached for welding.

This worked correctly a few days ago before the Prosperity Update.

Details:

* Game mode: Survival

* Grid size: Small Grid

* Issue occurs in Vanilla (also tested without mods)

* The problem happens before the block is fully welded

* The existing Merge Block is already part of a built grid

Steps to reproduce:

1. Build a Small Grid with a finished Merge Block.

2. Place another Merge Block directly against the existing Merge Block.

3. The new Merge Block loses its connection immediately and falls due to gravity.

Has anyone else experienced this after the Prosperity Update? Is this a known bug or a change in Merge Block behavior?

Since Update 1.210, projections supported through a merge-block pair can repeatedly weld and eject unfinished merge blocks. This breaks automated missile/drone printers, particularly on survival servers. Creative single-player generally works because the block is created fully built.

MyShipMergeBlock.UpdateOnceBeforeFrame() now unconditionally refreshes both merge-block neighbours:

MyShipMergeBlock other = GetOtherMergeBlock(); if (other != null) { CubeGrid.UpdateBlockNeighbours(SlimBlock); CubeGrid.UpdateBlockNeighbours(other.SlimBlock); }

While the projected merge is unfinished, IsWorking == false. ConnectionAllowedInternal() therefore rejects its merge-face neighbour, causing grid-disconnection detection to split it away.

This appears to be a regression from the 1.210 fix for grids remaining attached to disabled merge blocks.

Fix Only refresh merge neighbours following an actual IsWorking state transition, rather than on every UpdateOnceBeforeFrame() call. Also refresh the opposing block through its owning grid:

CubeGrid.UpdateBlockNeighbours(SlimBlock); other.CubeGrid.UpdateBlockNeighbours(other.SlimBlock);

This should preserve deliberate merge-block disconnection while allowing newly projected merge blocks to remain supported until functional.

After the Prosperity update, Merge blocks are not being placed connected. You cannot even put the second merge block on the existing one. Its scaffolding is going to fall.

This leads to all the printers in-game being broken because all the projector printers rely on merge blocks.

When welding a projected merge block with the other already complete merge block as the grid connection, the merge block connection unlocks before the block has been welded. It lets go of the incomplete merge block.

I noticed this because it breaks a PMW launch system I have. A sensor is set to detect small grids (when a missile is loose/launching) to turn of projector and welder as a safety measure, and open the missile door. Now it tries to weld a new missile but the merge block is immediately unattached triggering the safety.

Here is a link to the blueprint. https://steamcommunity.com/sharedfiles/filedetails/?id=3326303499 The issue presents itself in survival. I think it has to do with welding speed.