Trial spawner breaking results in false FastBreak

[metabrixkt]

Describe the false positive and how to replicate it

1. Place a trial spawner
2. Break the trial spawner you just placed...

Grim » JohnDoe failed FastBreak (x1) Diff=175090.0,Balance=176090.0

3. The block break gets cancelled and the trial spawner reappears

A few separate attempts to reproduce this with efficiency V resulted in these logs:

Grim » JohnDoe failed FastBreak (x1) Diff=175050.0,Balance=175050.0

Grim » JohnDoe failed FastBreak (x1) Diff=175109.0,Balance=176109.0

Grim version

31394f4

Server version

Paper 1.21.3-82-5a60ffb

Client version

Vanilla 1.21.3

Plugins

• GrimAC 2.3.69 (31394f4)
• ProtocolLib 5.3.0
• ViaVersion 5.2.1 (supporting 1.21-1.21.4 clients, though the bug is reproducible with the client version matching the server version, i.e. 1.21.3 in this case)
• ViaBackwards 5.2.1

[SamB440]

Can confirm but it takes a decade to break and the block hardness values seem correct

[SamB440]

As a temporary fix to not annoy legit players, I have exempted this block entirely.