Placing blocks quickly places two blocks at a time

Partner Rank: 2 (Important)

Verification Builds: 1.16.210 and above

Regression Builds: 1.16.100 and below

Summary:

When bridging (placing blocks quickly to build a bridge), blocks now appear 2 at a time, rather than the correct 1 at a time. Whilst this may appear insignificant, this has broken popular Player VS Player strategies. From both the placer and a viewers point of view, it also looks broken.

Affects currently Live Content: Yes (3PP Server Minigames that allow block placement)

Impact:

Community dissatisfaction

Creator video about impact (see video): https://www.youtube.com/watch?v=aHD-U7dnrno

Creator video about bridging technique (see recent comments): https://www.youtube.com/watch?v=thYxx7_-4h4

Repro Steps:

(this assumes the tester / developer knows how to quick, safe or "MJ" bridge. If not, please refer to https://www.youtube.com/watch?v=thYxx7_-4h4 for an introduction to bridging methods)

• Join any world with building permissions
• Get a stack of a normal block (stone, dirt, or anything similar)
• Quickly place blocks ("bridge") one after each other, using any technique

Observed Results:

The blocks place two at a time.

Expected Results:

The blocks place one at a time.

Screenshots/Videos attached: Yes:

https://www.youtube.com/watch?v=Uvm66soOH84

 

First clip/bridge: old behavior (correct), blocks place one by one

Second clip/bridge: new behavior (broken), blocks place two at a time

Notes:

Whilst the bug affects gameplay mainly in servers, where it is common to build this way, this bug is present in vanilla, realms and any other type of non-third party gameplay.