Unity Issue Tracker - UUM - The Editor freezes when copy pasting large amounts of characters into a Play Mode Scenario name or description

Fixed

Fixed in 6000.5.0a2

Votes

Found in

Issue ID

Regression

UUM - The Editor freezes when copy pasting large amounts of characters into a Play Mode Scenario name or description

-

Oct 28, 2025

Steps to reproduce:

Create a new Unity project using the Competitive Action Multiplayer template
Open the Play Mode Scenarios window (Window > Play Mode > Scenarios or Window > Multiplayer > Play Mode Scenarios)
Create a new Play Mode Scenario
Keep copy and pasting large amounts of characters into the Play Mode Scenario name or description
Observe the Editor

Actual results: The Editor freezes indefinitely

Expected results: There is either a character limit or the Editor does not freeze

Reproducible with versions: 1.6.1 (6000.0.61f1, 6000.2.10f1), 2.0.0 (6000.3.0b8, 6000.4.0a3)

Tested on (OS): MacOS SIlicon Sequoia 15.6.1